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Author Topic: Booting from SD Card - weird behavior  (Read 1100 times)
vkashesh
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« on: June 26, 2010, 04:21:49 PM »

Hi everyone!
I've been reading about booting from SD Card on SheevaPlug, and I am very interested in getting this to be my default boot location.

However, if I boot the plug electrically (meaning, I plug it in) I get the following crash dump:

 VFS: Cannot open root device "b301" or unknown-block(179,1)
 Please append a correct "root=" boot option; here are the available partitions:
 1f00            4096 mtdblock0 (driver?)
 1f01          519168 mtdblock1 (driver?)
 Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,1)
 [<c00309c0>] (unwind_backtrace+0x0/0xe0) from [<c003db20>] (panic+0x50/0x120)
 [<c003db20>] (panic+0x50/0x120) from [<c0008ec4>] (mount_block_root+0x1d4/0x214)
 [<c0008ec4>] (mount_block_root+0x1d4/0x214) from [<c000916c>] (prepare_namespace+0x16c/0x1c4)
 [<c000916c>] (prepare_namespace+0x16c/0x1c4) from [<c0008734>] (kernel_init+0xc0/0xec)
 [<c0008734>] (kernel_init+0xc0/0xec) from [<c0040b18>] (do_exit+0x0/0x6ac)

so I follow this by pressing the reset button and it goes through just fine.  Does this have to do with not allowing enough time for the SD card to mount? or is it happening due to something else?

I followed this wonderful guide to get my SD Card setup but I doubt it has anything to do with it since I am able to load from SD card, but not as I described above.
http://www.plugcomputer.org/plugwiki/index.php/SD_Card_As_Root_File_System
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birdman
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« Reply #1 on: June 27, 2010, 03:15:18 PM »

Does this have to do with not allowing enough time for the SD card to mount? or is it happening due to something else?
Without knowing the boot commands you have set we may never know.
For instance, have you added an mmcinit to the boot sequence?
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vkashesh
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« Reply #2 on: June 27, 2010, 03:18:41 PM »

thanks birdman for your reply.

Indeed - it was the mmcinit missing command that got it fixed.

I appreciate your input!
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