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top README: status update
author Space Falcon <falcon@ivan.Harhan.ORG>
date Wed, 01 Jul 2015 06:29:55 +0000
parents 78c894c7c471
children 36e3f6bf0156
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896:7c5b129573f6 897:e8bdd3d0c4c2
65 65
66 What we've done 66 What we've done
67 =============== 67 ===============
68 68
69 By a process of painstaking reintegration piece by piece, we have put together 69 By a process of painstaking reintegration piece by piece, we have put together
70 our own firmware suite for the Calypso that builds into a flashable image (but 70 our own firmware suite for the Calypso that builds into a flashable or
71 doesn't work properly yet - see below) and has the following essential 71 RAM-loadable image and has the following essential features/qualities/
72 features/qualities/attributes: 72 attributes:
73 73
74 * Targets Calypso rather than LoCosto. This decision is somewhat controversial, 74 * Targets Calypso rather than LoCosto. This decision is somewhat controversial,
75 i.e., one could make a valid argument that we should have gone with LoCosto 75 i.e., one could make a valid argument that we should have gone with LoCosto
76 instead. But in our defense, we already have several pre-existing devices 76 instead. But in our defense, we already have several pre-existing devices
77 with the Calypso chipset on which we would like to run libre firmware; as for 77 with the Calypso chipset on which we would like to run libre firmware; as for
102 * The version of Nucleus we use comes from a non-TI source; all TI GSM fw 102 * The version of Nucleus we use comes from a non-TI source; all TI GSM fw
103 sources we found have their Nucleus in binary-only libs. 103 sources we found have their Nucleus in binary-only libs.
104 104
105 * To reiterate: our compiler is gcc, *not* TI's proprietary TMS470! 105 * To reiterate: our compiler is gcc, *not* TI's proprietary TMS470!
106 106
107 Current status (2015-05) 107 Current status (2015-06-30)
108 ======================== 108 ===========================
109 109
110 We are currently using the Calypso GSM modem in the Openmoko GTA02 smartphone 110 Our current firmware can be built for two targets: Openmoko's Calypso modem
111 as our bring-up vehicle. This target has been chosen as the BUV because it is 111 built into their GTA01 and GTA02 smartphones (target gtamodem) and the Pirelli
112 very close to TI's reference hardware platform (Leonardo) on which TI's TCS211 112 DP-L10 feature phone. The functionality is the same on both targets: a modem
113 reference firmware was designed to run. Because our own firmware, despite 113 or pseudo-modem controlled by AT commands (no local UI on the Pirelli), and
114 having been reintegrated and rebuilt by us, is still based on TI's reference 114 only the voice+SMS subset, i.e., no CSD, fax or GPRS yet. The firmware is able
115 design and is only slowly diverging from that origin, it makes the most sense 115 to register successfully to a live commercial GSM network (using a legitimate
116 to bring our fw up on the most "vanilla" hw platform first, and only then port 116 SIM of course), and SMS sending and receiving both work; all SIM interface
117 to other hw targets of interest (Motorola and Pirelli phones) that exhibit 117 functions also work as far as we've tested them. But voice calls don't work
118 noticeable differences from TI's "canon". 118 yet; making them work is our next task.
119
120 Our current gcc-built GSM firmware image runs on this gtamodem target. But it
121 doesn't work properly yet: getting this firmware *built* was the first half of
122 the project (took a year and a half), and now we enter the second stage:
123 debugging problems one by one until we make it work. Right now one can flash
124 our firmware image into a GTA02 modem and boot it; the modem running our fw
125 will then present a working AT command interface: one can exercise trivial
126 functions like version queries and even bring up SIM communication; one can
127 successfully query the SIM for its IMSI and phone numbers, for example. But
128 attempting to bring the radio interface up fails. There is also some weird
129 interaction with a hardware power cycling issue which we still need to
130 characterize further.
131
132 We are confident that we can fix whatever issues currently prevent our gcc-built
133 firmware from working, and get it to work no worse than the original half-src,
134 half-binary TCS211 - at least in the voice+SMS functional subset, without CSD,
135 fax or GPRS. Once we reach that point, we will then port our FreeCalypso fw to
136 our non-Openmoko targets of interest (Motorola C1xx and Pirelli DP-L10), and
137 start reintegrating TI's reference UI code - our current fw is controlled by AT
138 commands only. Then later re-add CSD, fax and GPRS.
139 119
140 We have also produced some host tools for loading firmware into Calypso GSM 120 We have also produced some host tools for loading firmware into Calypso GSM
141 devices, for communicating with running firmwares over the RVTMUX interface, 121 devices, for communicating with running firmwares over the RVTMUX interface,
142 and for manipulating TI's flash file system. See README.hosttools for the 122 and for manipulating TI's flash file system. See README.hosttools for the
143 details. 123 details.