** Unable to read "/uInitrd" from mmc 0:1 **
I guess it cannot find a file called uInitrd in the root of the filesystem.
bootcmd_mmc=mmcinit; ext2load mmc 0 0x0800000 /uInitrd; ext2load mmc 0 0x400000 /uImage
bootcmd=setenv bootargs $(bootargs_console); run bootcmd_mmc; bootm 0x400000 0x0800000
Does that version of u-boot have the ext2ls command?
You could try the following to see what files are in the root directory. It may be u-boot is having trouble reading the filesystem or the file has been deleted.
ext2ls mmc 0:1 /