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comparison doc/Compal-FFS @ 733:bed7981ac8ca

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doc/Compal-FFS: update for IMEI found in OTP cells
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 28 Aug 2020 15:58:46 +0000
parents 6585c21cc4d4
children
comparison
equal deleted inserted replaced
732:4c19ca123c97 733:bed7981ac8ca
36 FFS stores the fw version that created it, and when their fw boots and sees 36 FFS stores the fw version that created it, and when their fw boots and sees
37 that the FFS is from a different version, they automatically do a full reformat. 37 that the FFS is from a different version, they automatically do a full reformat.
38 38
39 The fact that the FFS on these Compal phones is strictly non-essential and can 39 The fact that the FFS on these Compal phones is strictly non-essential and can
40 be trivially blown away and recreated implies that it does NOT store any vital 40 be trivially blown away and recreated implies that it does NOT store any vital
41 data: no IMEI, no RF calibration values. Instead the IMEI, the RF calibration 41 data: no IMEI, no RF calibration values. Instead the IMEI is programmed into
42 values and a bunch of other records which we are not able to understand are 42 the flash chip's protection register (OTP cells), whereas RF calibration values
43 stored in a completely different flash data structure of Compal's own invention: 43 and a bunch of other records which we are not able to understand are stored in
44 see our Compal-calibration article. 44 a completely different flash data structure of Compal's own invention: see our
45 Compal-calibration article.
45 46
46 Language reset 47 Language reset
47 ============== 48 ==============
48 49
49 There is, however, one additional issue which you need to be aware of if you 50 There is, however, one additional issue which you need to be aware of if you