[U-Boot] MMC initialisation

[U-Boot] MMC initialisation

[Reinhard Meyer]

Arghhh....
Didn't see the original message was not sent to the list...
So my reply was neither...

On 06.01.2011 04:46, Reinhard Meyer wrote:
> Dear ????,

Please, dear Henry, ALL u-boot related questions MUST go to the mailing list, too.

>> I will porting U-Boot mmc part to my own board, still use U-Boot as bootloader.
>> First, I should research the source code of mmc part in U-Boot.
>> I found top9000eval_xe board support mmc, and SoC same with mine, (arm926ejs)
>> Mr. Reinhard Meyer is enthusiastic working here, Thanks a lot!
>> Let me describe mmc driver init process: (version: u-boot.2010.12)
>> 1. arch/arm/lib/board.c -> board_init_r() -> mmc_initialize(bd);
>> 2. drivers/mmc/mmc.c -> int mmc_initialize(bd_t *bis)
>> 3. board/emk/top9000/top9000.c -> int board_mmc_init(bd_t *bd)
>> -> return atmel_mci_init((void *)AT91_BASE_MCI);
>> 4. drivers/mmc/gen_atmel_mci.c -> int atmel_mci_init(void *regs)
> ...
>> mmc->init = mci_init;
>> // mmc->init(mmc); // How it Implementation
>> /* need to be able to pass these in on a board by board basis */
> ...
>
> I am not sure what your question/problem is here.
>
> If you wonder how and when mmc->init() is called, it is only called when the
> command "mmcinfo" is given.
>
> This is sure not perfect, and discussions have been around about this.
> "common/cmd_mmc.c" would need some rework there...
>
> However discussions are left open on how exactly changes should be done.
>
> Best Regards,
> Reinhard