FreeCalypso > hg > fc-tourmaline

annotate src/cs/drivers/drv_app/ffs/board/HISTORY @ 276:4221c724c664

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R2D: preparations for adding LCD hardware suspend handling
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 07 Sep 2021 21:05:38 +0000
parents 4e78acac3d88
children
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4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
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1 Brief Revision History of FFS
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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2 ============================================================
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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3 Revision 5.27:
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4
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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5 - API change:
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6 Made change request from TIF.
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7
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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8 Renamed functions:
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9 ffs_init() to ffs_initialize()
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10 ffs_env_init/start/stop/kill() to ffs_init/start/stop/kill() (in ffs_env.[ch])
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11
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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12 NOTE: Because of this API change are we not backward compatible with earlier FFS versions!
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13
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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14
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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15 Revision 5.18:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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16
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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17 - Implemented new ffs protocol. Improvements:
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18
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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19 * More intelligible.
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20 * No static testmode buffer (Before 8kB!)
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21 * Stream interface (Only flash size limit for file transfer)
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22 * Use blocking functions in target (waits for data to be written etc)
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23
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24 The new protocol require etm v0.127 or above in target.
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25
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26 Note the "old" protocol is still supported.
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27
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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28 Revision 5.14:
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29
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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30 - BUGFIX: http://bugs.tidk.ti.com/bugs/show_bug.cgi?id=313.
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31 A sudden power off can in a rare case trikker FFS to use the last free
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32 block. Because of the missing free block is it not possible to make a
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33 garbage collection/reclaim data! (no further write will be possible!).
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34
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35 Revision 5.6:
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36
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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37 - Implemented a request id. On success, all non-blocking functions return a unique request identifier (request_id). This same id is returned in the associated request confirm message. This feature can be used to pair requests with confirmations when using the non-blocking function interface.
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38
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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39 Revision 4.6:
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40
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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41 - Made support for random access to a file (open in RDWR mode).
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42
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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43 - Removed API functions ffs_xstat() and ffs_xfstat() because its function is covered by ffs_xlstat().
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44
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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45 - Renamed ffs_linkstat() to ffs_lstat() (POSIX alike).
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46
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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47 - Made a non blocking version of ffs_seek() because it can now block the caller in several second because it sometimes need to flush the stream buffer.
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48
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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49 - Made new API function ffs_fdatasync() which makes it possible to
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50 flush the stream buffer ad any time.
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51
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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52 Revision 3.4:
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53
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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54 - Changed function ffs_file_write() so it automatil split one huge write up
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55 in several small chunks instead of one big chunk. This makes support of
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56 files that is bigger than one flash block.
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57
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58 Revision 3.2:
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59
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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60 - Implemented ffs_truncate() and ffs_ftruncate(). These functions make it
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61 possible to truncate a file by the file name or the file descriptor.
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62
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63 Revision 3.1:
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64
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65 - Changed ffs_stat() function. Implemented ffs_xlstat() and ffs_fstat().
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66
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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67 Revision 2.15:
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68
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69 - Implemented ffs_rename(). This function makes it possible to move and rename
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70 files, dirs and symlinks.
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71
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72 Revision 2.10:
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73
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74 - Implemented stream functions: ffs_open, ffs_close, ffs_read, ffs_write and
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75 ffs_seek.
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76
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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77 Revision 1.29:
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78
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79 - The copying of the single bank driver code to RAM is now handled
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80 internally by ffsdrv_init(). This means linker dependency is gone and the
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81 linker file does not need to have any special sections for the FFS
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82 single-bank driver code. Actually, it must NOT have the special sections!
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83
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84
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85 Revision 1.28:
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86
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87 - Updated code for Calypso chipset and RiViera Frame.
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88
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89
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90 Revision 1.27:
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91
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92 - Intel single-bank driver bugfixed, tested and working.
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93
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94
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
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95 Revision 1.24:
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96
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97 - Implemented Intel dual/multi-bank and single-bank flash support. Untested!
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98 - Changed ffs_fread() and ffs_readlink() semantics and prototype. They now
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99 return an integer denoting the number of bytes actually read.
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100 - Changed ffs_opendir() semantics and prototype. It now returns an integer
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101 denoting the number of entries in the directory.
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102 - Replaced 'filesize_t' by 'int' in FFS API functions.
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103 - Increased FFS_INODES_MAX_DEFAULT from 512 to 1024. This means that FFS can
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104 contain up 1024/2 = 512 objects.
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105
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106
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107 Revision 1.23:
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108
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109 - Implemented ffs_query(Q_DEV_DRIVER) returning the flash device driver
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110 identifier.
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111
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112
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113 Revision 1.22:
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114
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115 - Implemented AMD single-bank flash support.
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116
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117
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118 Revision 1.21:
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119
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120 - Changed ffs_fcontrol() prototype such that <param> argument is 'int'
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 instead of 'uint16'.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 Revision 1.20:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 - Only one (auto-generated) target file exists now, namely target.c which
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 replaces previous targetffs.c and taskffs.c.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 - Implemented ffs_query(Q_DEV_BASE) returning the start address of FFS in the
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 flash device.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 - Removed PCM functionality from testmode ffs protocol (tmffs.c).
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 Revision 1.19:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 - Corrected bug in ffs_query(Q_BYTES_FREE); it did not subtract number of
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 bytes lost.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 Revision 1.18:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 - Implemented call-back functionality. All modify functions have a sibling
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 function with same name but suffix '_nb' for 'non-blocking'. This sibling
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 function has an additional argument specifying how the caller want the
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 result of the operation communicated back; either by mail or call-back
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 function. This way, *all* error codes can be returned and caller knows when
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 data has actually been written/committed to the actual device memory.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 Revision 1.12:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 - Replaced old crash recovery code with true journalling system. The old
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 crash recovery code had in a few rare scenarios the risk of rendering FFS
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 useless upon a power-fail.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 Revision 1.9:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 - ffs_preformat() now calls the user defined function ffs_is_modifiable()
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 with empty string (not a NULL string). This means that permission to
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 re-formatting ffs can be controlled.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 Revision 1.3:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 - Implemented device wear-levelling.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 Revision 0.517:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 - Added HISTORY file.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 - Flash driver updated to take flash base address into account when doing
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 writes and erasures (not when auto-detecting device).
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 - Moved task.[hc] from ffs.mak to ffsdrv.mak. These files are now included
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 in object releases.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 Revision 0.516:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 - Renamed ffs_config.mak to ffsdrv.mak.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 - Splitted pcm.c into pcmcode.c and pcmdata.c. pcmcode.c contains only pcm
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 function code. pcmdata.c contains only pcm data tables.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 - Corrected bug in pcm_WriteRecord().
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 Revision 0.515:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 - Corrected possible bug in erase suspend; it did not check for
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 completion. Bug has never been observed in practice.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 Revision 0.514:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 - Added support of flash devices: AMD Am29DL161T and Fujitsu MBM29DL16xT.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 Revision 0.512:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 - Added flash device auto-detection. This *only* works for flash devices
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 mapped to address zero! Remember that both ffs_flash_manufact and
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 ffs_flash_device (in cfgffs.c) must be zero in order for auto-detection to
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 be enabled.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 Revision 0.510:
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 - Added low-level driver for SST flash devices.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 - Added support of flash device: SST SST36VF1601.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 - Added ffs_query(Q_FFS_FORMAT_WRITE) and renamed Q_FFS_FORMAT to
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 Q_FFS_FORMAT_READ. With this, we can both query the ffs format read from
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 ffs as well as the format version written on a fresh format. This can be
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 used to determine compatibilty between ffs formats.
4e78acac3d88 src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 - Corrected non-critical bug in ffs_remove().