[U-Boot] [PATCH v2a] AT91: add SD/MMC support

[Reinhard Meyer <u-boot@emk-elektronik.de>]

Xu, Hong wrote:
> Hi Reinhard,
> 
> In Linux, I used `fdisk' to cerate 2 primiary partitions on SD card, each is about 1G bytes.
> I used `mkfs.ext2 /dev/sdc1' and 'mkfs.ext2 /dev/sd2' to format the 2 partitions and then copy some files on them.
> 
> I used SanDisk 2GB SD Card.
> 
> 
> But in U-Boot,
> 
> ----8<----
> U-Boot> mmc init
> mmc: requested clock 150000 is too low; changed to 194000
> Manufacturer ID:       03
> OEM/Application ID:    5344
> Product name:          SD02G
> Product Revision:      8.0
> Product Serial Number: 27337763
> Manufacturing Date:    09/12
> SD Card detected (RCA 43690)
> raw CSD data: 00260032 5f5a83ae fefbcfff 928040df
> Read block length: 1024
>   (Supports partial reads)
> Card capacity: 1884 Mbytes
> mmc: Using 131072 cycles data timeout (DTOR=0x62)
> mmc: blocksize reduced to 512, number of blocks: 3862528
> mmc1 is available
> U-Boot> ext2ls mmc 0
> bad MBR sector signature 0x0000
> ** Bad partition - mmc 0:1 **
> U-Boot> ext2ls mmc 1
> bad MBR sector signature 0x0000
> ** Bad partition - mmc 1:1 **

The number before the ":" is irrelevant (with this driver),
after the ":" is the partition number. So anything:1
would be like /dev/sda1.

I can't test right now (not in the office) but it seems that
a proper mbr is required. You killed that when zeroing the card.
Not sure right now how you get that back under LinuX (win: fdisk /mbr)

And please replies to the list as well.

Reinhard