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