Thread: [PW1] stuck on U-boot / USB Download Mode / unbrick attempt
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Old 06-09-2015, 08:43 AM   #14
eureka
but forgot what it's like
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Quote:
Originally Posted by chefchens View Post
more or less just out of curiosity I build a yoshime u-boot with a debug switch turned on in mmc.c

it does seem that the my mmc chip answers to u-boot quite a bit
i will try to make sense out of the log in the next days.
maybe somebody else wants to jump in
From my reading of sources, it looks like card works fine from the start, but it can't switch to wider data bus width (I read mmc_startup function in drivers/mmc/mmc.c of U-Boot). Maybe if mmc->card_caps |= (MMC_MODE_4BIT | MMC_MODE_8BIT); line will be commented, device will boot.
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