On 4/27/2013 5:26 PM, Jagan Teki wrote:
Hi Josh,
On Sat, Apr 27, 2013 at 11:55 AM, Josh Wu josh.wu@atmel.com wrote:
Hi, Jagan
On 4/27/2013 4:51 AM, Jagan Teki wrote:
Hi All,
I need some help regarding mmc write and mmc read commands usage.
I am using a 4GB SD/MMC plus and socked eMMC cards, usually I am formatting these cards on my host pc with fat partition and copy the images into card. while in the u-boot level I am reading the images from card and copy it onto mem addr like fatload mmc 0 0x1000 uImage.
Can we write the images onto these cards in u-boot level?, using mmc write. same way can we read back using mmc read? if so how to do that.
yes, define the CONFIG_FAT_WRITE macro in your board config file. re-build your u-boot. then you will find "fatwrite" command.
U-Boot> fatwrite fatwrite - write file into a dos filesystem
Usage: fatwrite <interface> <dev[:part]> <addr> <filename> <bytes> - write file 'filename' from the address 'addr' in RAM to 'dev' on 'interface'
so you can use: fatwrite mmc 0 0x20000000 file 0x4000
Thanks for your information.
I will try the fatwrite, and this must require to have the card should formatted as FAT on host, is it?
yes. Also U-Boot can support EXT2, EXT4, UBI read. And EXT4 write (CONFIG_CMD_EXT4_WRITE).
Any possibility to do the formation on u-boot itself.?
according to my understanding, no.
Best Regards, Josh Wu
Thanks, Jagan.
Best Regards, Josh Wu
Request for help.
Thanks, Jagan. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot