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annotate gsm-fw/cfgmagic/feature.pirhack-ffs @ 942:042c178ebac5

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gsm-fw/cfgmagic: logic for target-dependent features streamlined a little
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Sun, 01 Nov 2015 03:05:06 +0000
parents 6e7410f7975c
children
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1 # Concerning the FFS, there is one fundamental difference between the gtamodem
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2 # and pirelli targets: whereas the content of Openmoko's modem FFS is directly
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3 # fit for reuse by our fw (resulting from the phylogenetic proximity of the two
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4 # firmwares), Pirelli's original FFS has the same format, but its content is so
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5 # different that trying to reuse it would be more trouble than it is worth.
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6 # (And Pirelli's FFS contains no IMEI or RF calibration data to boot!)
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7 #
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8 # Therefore, I (FC developer Space Falcon) have decided that when targeting the
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9 # Pirelli, it would be better for us to start from our own blank FFS than to
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10 # deal with the original. However, because there is no single correct answer
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11 # as to which region of the flash chip we should use (other than needing to be
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12 # in the flash2 bank so we can use the more efficient multibank flash driver),
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13 # this feature pirhack-ffs takes two required arguments: the number of the
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14 # first flash2 sector to be used for the FFS and the total number of sectors
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15 # to be used. For example, this setting:
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16 #
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17 # feature pirhack-ffs 24 7
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18 #
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19 # will configure our GSM fw to put its FFS in the last 7 256 KiB sectors of the
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20 # 2nd flash chip select, which coincidentally form an independent read/write
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21 # bank, and are part of the flash2 region which appears to be "unused" by the
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22 # original firmware. Or you can use all of this "unused" area like this:
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23 #
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24 # feature pirhack-ffs 18 13
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25 #
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26 # The sum of the two numbers must not exceed 31, i.e., the end of our FFS must
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27 # be at or before the end of the "large sectors" main part of flash2.
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28 # Specifying feature pirhack-ffs 0 18 will make our FFS use the same sectors
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29 # as the original, but attempting to reuse the original FFS without reformatting
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30 # is NOT recommended or supported.
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31
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32 check_target_feature "$1"
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33
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34 if [ $# != 3 ]
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35 then
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36 echo "feature pirhack-ffs: two arguments required" 1>&2
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37 exit 1
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38 fi
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39
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40 FFS_IN_RAM=0
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41 CONFIG_PIRHACK_FFS=1
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42 CONFIG_PIRHACK_FFS_START=$2
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43 CONFIG_PIRHACK_FFS_NBLOCKS=$3
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44 CONFIG_FLASH_WRITE=1
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45 export_to_c CONFIG_PIRHACK_FFS
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46 export_to_c CONFIG_PIRHACK_FFS_START
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47 export_to_c CONFIG_PIRHACK_FFS_NBLOCKS
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48 export_to_c CONFIG_FLASH_WRITE