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Subject: Re: sansa sd card detection (some hints)

Re: sansa sd card detection (some hints)

From: Jonathan Gordon <jdgordy_at_gmail.com>
Date: Wed, 9 May 2007 08:07:20 +1000

congrats on getting it mostly (?) working :)

On 08/05/07, Antonius Hellmann <antonius.hellmann_at_gmx.de> wrote:
>
>
> I did a first attempt in finding the magics of the sd card detection in the
> sansa software by using the emulator.
> Here are the results:
>
> From the debug screen: GPIOA bit7 (0x80) goes low on sd card insertion.
>
> The sansa software executes gpio in interrupt context. I think I have
> identified following cpu interrupts:
> Bits 0-63
> 0: timer1
> 1: timer2
> 2: RTC
> 4: MBOX4
> 9: forced interrupt
> 18: LCD_REG_4
> 26: DMA
> 32: GPIOs
>
> At sd card insertion the software seems to execute following register
> manipulations:
>
> counter address register register data
> ========================================================
> 705df60 000b7318 DEV_RESET 60006004 R4-00000000
> 705df62 000b7320 DEV_RESET 60006004 W4-00004000
> 705df65 000b732c DEV_RESET 60006004 R4-00004000
> 705df67 000b7334 DEV_RESET 60006004 W4-00000000
> 705dfed 0003d018 REG_12 70008244 R4-0000a000
> 705dfef 0003d020 REG_12 70008244 W4-0000a000
> 705dff2 0003d02c REG_11 70008240 R4-0000a000
> 705dff4 0003d034 REG_11 70008240 W4-0000a000
> 705dff7 0003d040 REG_12 70008244 R4-0000a000
> 705dff9 0003d048 REG_12 70008244 W4-00008000
> 705dffc 0003d054 REG_12 70008244 R4-00008000
> 705dffe 0003d05c REG_12 70008244 W4-0000a000
> 705e001 0003d068 REG_11 70008240 R4-0000a000
> 705e003 0003d070 REG_11 70008240 W4-00008000
> 705e006 0003d07c REG_11 70008240 R4-00008000
> 705e008 0003d084 REG_11 70008240 W4-0000a000
> 705e00b 0003d090 SD_STATE_REG 70008238 W4-00000004
> 705e05a 0003de2c REG_1 70008208 W4-00000006
> 705e0d8 0003daac REG_5 70008224 W4-0000000f
> 705e106 0003d8a8 CMD_REG0 70008228 W4-00000000
> 705e109 0003d8b4 CMD_REG1 7000822c W4-00000000
> 705e10c 0003d8c0 CMD_REG2 70008230 W4-00000000
> 705e121 0003d9d4 UNKNOWN 70008210 W4-00000100
> 705e189 0003dc80 STATUS_REG 70008204 R4-00003080
> 705e191 0003dcb0 STATUS_REG 70008204 R4-00003080
> 705e193 0003dcb8 STATUS_REG 70008204 R4-00003080
> 705e249 0003daac REG_5 70008224 W4-0000000f
> 705e277 0003d8a8 CMD_REG0 70008228 W4-00000037
> 705e27a 0003d8b4 CMD_REG1 7000822c W4-00000000
> 705e27d 0003d8c0 CMD_REG2 70008230 W4-00000000
> 705e29c 0003d9c4 UNKNOWN 70008210 W4-00000001
> 705e304 0003dc80 STATUS_REG 70008204 R4-00003080
> 705e30c 0003dcb0 STATUS_REG 70008204 R4-00003080
> 705e30e 0003dcb8 STATUS_REG 70008204 R4-00003080
> 705e320 0003d834 RESPONSE_REG 70008234 R4-00000001
> 705e327 0003d834 RESPONSE_REG 70008234 R4-00000001
> 705e32e 0003d834 RESPONSE_REG 70008234 R4-00000001
> 705e3d3 0003daac REG_5 70008224 W4-0000000f
> 705e401 0003d8a8 CMD_REG0 70008228 W4-00000029
> 705e404 0003d8b4 CMD_REG1 7000822c W4-00000010
> 705e407 0003d8c0 CMD_REG2 70008230 W4-00000000
> 705e421 0003d9b0 UNKNOWN 70008210 W4-00000003
> 705e489 0003dc80 STATUS_REG 70008204 R4-00003080
> 705e491 0003dcb0 STATUS_REG 70008204 R4-00003080
> 705e493 0003dcb8 STATUS_REG 70008204 R4-00003080
> 705e4a5 0003d834 RESPONSE_REG 70008234 R4-00003f80
> 705e4ac 0003d834 RESPONSE_REG 70008234 R4-0000ffff
> 705e4b3 0003d834 RESPONSE_REG 70008234 R4-0000ffff
>
> Because the emulator does not yet give the correct register content after sd
> card insertion, the above sequence is not complete and the returned values
> (R4-values) must not be regarded as the real ones.
> These results may give some hints, how to do the sd card detection in our
> software.
Received on 2007-05-09


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