Hi Gianluca,
lpc313x_mmc
lpc313x_mmc.0: LPC313x MMC controller at irq 26
It looks like the MMC driver is being loaded correctly, but I
don't see the card
insertion messages or the card initialization is delayed.
Try swapping the card detect jumper next to the SD card slot to
see if it helps.
If it doesn't, there is a patch at the lpc3000 Yahoo news group
that improves,
or possibly fixes, SD card detection.
You may also have to delay root filesystem mount to allow the SD
card a little
time to initialize. Try adding rootdelay=3 to the linux command
line and adjust
as necessary if the SD card init is falling behind the mount
attempts.
Good luck!
Kevin
From:
address@hidden
[mailto:address@hidden On Behalf Of Gianluca
Valentino
Sent: Tuesday, March 02, 2010 9:32 AM
To: address@hidden; address@hidden
Subject: RE: [Ltib] Cannot boot rootfs from SD card LPC 3131
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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