U-Boot and MMC/SDIO
U-Boot supports MMC Cards with multiple paritions, with the FAT file system. For general information on MMC Cards - see the MMC Cards page.
To initialize the mmc/sdio subsystem, use the mmcinit call:
bfin> mmcinit CID information: Manufacturer ID: 03 OEM/Application ID: 5344 Product name: SD256 Product Revision: 8.0 Product Serial Number: 544862406 Manufacturing Date: 07/08 SD Card detected (RCA 32769) CSD information: CSD structure version: 1.0 Card command classes: 5f5 Max trans speed: 25MHz Read block length: 512 Write block length: 512 Card capacity: 252968960 bytes
To get the FAT info about the card, use the fatinfo command
bfin> help fatinfo
fatinfo <interface> <dev[:part]>
- print information about filesystem from 'dev' on 'interface'
bfin> fatinfo mmc
Interface: MMC
Device 0: Vendor: Man 035344 Snr 2079f0c6 Rev: 8 0 Prod: SD256
Type: Hard Disk
Capacity: 241.2 MB = 0.2 GB (494080 x 512)
Partition 1: Filesystem: FAT16 " "
To list the files on the card, use the fatls command:
bfin> help fatls
fatls <interface> <dev[:part]> [directory]
- list files from 'dev' on 'interface' in a 'directory'
bfin> fatls mmc 0:1
6349262 uimage
1 file(s), 0 dir(s)
To load a file from the MMC/SDIO card, use the fatload command
bfin> help fatload
fatload <interface> <dev[:part]> <addr> <filename> [bytes]
- load binary file 'filename' from 'dev' on 'interface'
to address 'addr' from dos filesystem
bfin> fatload mmc 0:1 0x1000000 /uimage
reading /uimage
6349262 bytes read
And then you can boot the image as normal.
bfin> bootm ## Booting kernel from Legacy Image at 01000000 ... Image Name: Linux-2.6.28.10-ADI-2009R1 Created: 2009-06-10 6:06:18 UTC Image Type: Blackfin Linux Kernel Image (gzip compressed) Data Size: 6349198 Bytes = 6.1 MB Load Address: 00001000 Entry Point: 0027d49c Verifying Checksum ... OK Uncompressing Kernel Image ... OK Starting Kernel at = 0027d49c