RE: [Ltib] Cannot boot rootfs from SD card LPC 3131

[Gianluca Valentino]

Many thanks for your reply, I have included support for MMC/SD using the following:

Device Drivers ->
                                 <*> MMC/SD/SDIO Card support ->

                                                                                                 [*] MMC Debugging
                                                                                                 [ ] Allow unsafe resume (DANGEROUS)
                                                                                                 <*> MMC Block device driver
                                                                                                 [*] Use bounce buffer for simple hosts
                                                                                                <*> SDIO UART/GPS class support
                                                                                                 < > MMC host test driver
                                                                                                 <*> NXP LPC313x SD/MMC Card Interface Support
                                                                                                 <*> Secure Digital Host Controller Interface Support
                                                                                                 <*> MMC/SD/SDIO over SPI

elsewhere I have also enabled the Ext2 filesystem support.

SD Card booting is definitely possible in theory since there exists a jumper configuration for it on the development board.

I have partitioned my SD card properly (according to NXP guide), and tried more than one SD Card just in case, but without success.

I am able to access the SD card and copy the rootfs and kernel image to RAM at boot time (I use Apex bootloader) using root=/dev/ram0 rw and then boot Linux. However, since everything is in RAM, any changes I make to the rootfs are lost when I reboot.

I am also able to access the SD card after Linux has booted as explained above, and the partitions show up as mmcblk0 and mmcblk0p1, and I can access them normally.

It seems the problem is at boot time, since only NAND partitions are recognised at boot time.

Thanks and regards,

Gianluca Valentino

> Date: Tue, 2 Mar 2010 09:50:35 -0300
> Subject: Re: [Ltib] Cannot boot rootfs from SD card LPC 3131
> From: address@hidden
> To: address@hidden
> CC: address@hidden
>
> Hi Gianluca,
>
> On 3/2/10, Gianluca Valentino <address@hidden> wrote:
> >
> > Dear All,
> >
> > I wish to boot Linux on my LPC 3131 in the following manner:
> >
> > startup = copy ext2://1/zImage 0x30008000; boot
> > cmdline console=/dev/ttyS0,115200n8 root=/dev/mmcblk0p1 rw rootfstype=ext2
> >
> > However I get the following:
> >
> > VFS: Cannot open root device "mmcblk0p1" or unknown-block(2,0)
> > Please append a correct "root=" boot option; here are the available
> > partitions:
> > 1f00 240896 mtdblock0 (driver?)
> > 1f01 4096 mtdblock1 (driver?)
> > Kernel panic - not syncing: VFS: Unable to mount root fs on
> > unknown-block(2,0)
> >
> > Don't worry about the RAMDISK IMAGE too big part, that's because I used a
> > rootfs of > 64MB, for smaller rootfs.ext2 it still gives me the same errors
> > at the end.
> >
> > Could you please help me out?
> >
>
> Your kernel doesn't have support to MMC/SD or your kernel can't find
> it. Make sure you compiled your kernel with support to MMC/SD
> interface.
>
> xyz_core: MMC/SD card detected in socket 0:1
> mmcblk0: mmc1:b368 SD XYZKiB
> mmcblk0: p1
>
> Best Regards,
>
> Alan
>
>
> > Thanks and regards,
> >
> > Gianluca Valentino
> > _________________________________________________________________
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