we've just got back our iMX28 board based on the EVK. The only major difference is that we chose to run mDDR rather than DDR2.
I've built the kernel for mDDR and it mostly runs fine with uBoot etc and memory is being tested and read ok.
The problem i have is that the boot up of the kernel flags this problem.
mmc0: new high speed SD card at address 0007
mmcblk0: mmc0:0007 SU02G 1.83 GiB
mmcblk0: p1 p2 p3
mxs-rtc mxs-rtc.0: setting system clock to 1970-01-01 00:00:05 UTC (5)
VFS: Cannot open root device "ubi0:rootfs1" or unknown-block(0,0)
Please append a correct "root=" boot option; here are the available partitions:
b300 1921024 mmcblk0 driver: mmcblk
b301 35084 mmcblk0p1
b302 35112 mmcblk0p2
b303 1849764 mmcblk0p3
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[<c00336c4>] (dump_backtrace+0x0/0x114) from [<c03ba940>] (dump_stack+0x18/0x1c)
r7:c0028a24 r6:00008000 r5:c7c14000 r4:c051b0b8
[<c03ba928>] (dump_stack+0x0/0x1c) from [<c03ba9a4>] (panic+0x60/0xdc)
[<c03ba944>] (panic+0x0/0xdc) from [<c0008fe0>] (mount_block_root+0x1d8/0x218)
r3:00000000 r2:00000000 r1:c7c27f78 r0:c046a025
[<c0008e08>] (mount_block_root+0x0/0x218) from [<c00091b0>] (prepare_namespace+0x94/0x1c4)
[<c000911c>] (prepare_namespace+0x0/0x1c4) from [<c00084e8>] (kernel_init+0x118/0x158)
[<c00083d0>] (kernel_init+0x0/0x158) from [<c004d1bc>] (do_exit+0x0/0x600)
After reviewing i can see that the .config file gets changed from
CONFIG_PKG_BOOT_STREAM_CMDLINE1="noinitrd console=ttyAM0,115200 root=/dev/mmcblk0p3 rw rootwait ip=none gpmi"
CONFIG_PKG_BOOT_STREAM_CMDLINE1="console=ttyAM0,115200 rdinit=/linuxrc rw gpmi"
after i run the ./ltib -p boot_stream.spec –f
If anyone has got the iMX28 working with mDDR i'd happy to hear how they got on or if they had this problem.