From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yegor Yefremov <yegor_sub1@visionsystems.de>
Date: Thu, 14 Oct 2010 12:11:12 +0200
Subject: [Buildroot] VFS: Cannot open root device "mtd ...
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References: <0C11C5BF0B29FD43A8D0250F711D497F7F663977FF@ex01-ubitronix.ubitronix.local>
Message-ID: <4CB6D740.8030105@visionsystems.de>
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To: buildroot@busybox.net

> I am new to buildroot and this group
> I am working with the at91sam9260ek board and NAND Flash
> 
> Currently I am able to compile using buildroot kernel - Linux 2.6.34.1
> 
> I flashed the uImage at 0x200000 and root.jffs2 at 0x400000
> Also the uboot, uboot.env at 0x20000 and 0x60000 from the demo along with the at91bootstrap
> 
>  
> 
> When I boot, I get the following erroneous response
> 
> rtc-at91sam9 at91_rtt.0: hctosys: unable to read the hardware clock
> 
> VFS: Cannot open root device "mtdblock0" or unknown-block(0,0)
> 
> Please append a correct "root=" boot option; here are the available partitions:
> 
> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
> 
>  
> 
> I tried with more numbers to mtdblock0/1/4 and mtd 0/1/4 etc  
> 
> Still I get the same error.
> 
>  
> 
>              VFS: Cannot open root device "mtd0" or unknown-block(0,0)
> 
> 
> For info:
> bootcmd=nand read 0x22200000 0x00200000 0x00168CF8; bootm 0x22200000
> 
> I also have made the mentioned changes in the at91sam9260ek_defconfig file for NAND ...
> 
> CONFIG_MTD=y
> CONFIG_MTD_PARTITIONS=y
> CONFIG_MTD_CHAR=y
> CONFIG_MTD_BLOCK=y
> CONFIG_MTD_NAND=y
> CONFIG_MTD_NAND_YOURBOARD=y
> CONFIG_JFFS2_FS=y
> CONFIG_JFFS2_FS_DEBUG=0
> CONFIG_JFFS2_FS_NAND=y
> 
>  
> 
> And of course ? setenv bootargs 'mem=64M console=ttyS0,115200 root=/dev/name_of_block_device rw rootfstype=jffs2'
> 
> 
> I cannot find my way out ....
> If any idea, then do let me know
> 
> Thanks a lot.
> abhiash

Please provide your partition table as it is defined in kernel: arch/arm/mach-at91/board-sam9260ek.c
Have you altered this file? Or what board file you're using?

Complete bootlog were also good.

Best regards,
Yegor