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

[aaron]

You might need to specify how your flash is partitioned in order for the
kernel to be able to mount your root file system.  Here's an example of
mine.  I have 64 MB of flash.  My root file system is 8 MB, starting at an
offset of 3 MB from the beginning.  In my case my root file system is read
only, but you can omit the "ro" if you want read/write access.

mtdparts=phys_mapped_flash:3m(hrcw/kernel)ro,address@hidden(rootfs)ro,address@hidden(spare),address@hidden(uboot)ro

>
> Dear Mr Wells,
>
>
>
> Thanks for your reply. What is the file exactly called? I found nothing
> related to it in the files section.
>
>
>
> I tried different SD card jumper configurations and rootdelay as you said,
> but without success. Exactly the same output results.
>
>
>
> I am trying this configuration with root=/dev/mmcblk0p1 because I would
> like that any changes to files I make while running linux on the board
>
> are then saved permanently somewhere. I've already tried using NAND flash
> but although I could write apex, kernel image and rootfs to NAND, I could
> not
>
> boot using root=/dev/mtdblock0 or root=/dev/mtdblock1. This is strange
> since these devices are actually showing up during boot as shown in my
> output from
>
> the console.
>
>
>
> Thanks and regards,
>
>
>
> Gianluca
>
>
>
> From: address@hidden
> To: address@hidden; address@hidden; address@hidden
> Date: Wed, 3 Mar 2010 00:26:58 +0100
> Subject: RE: [Ltib] Cannot boot rootfs from SD card LPC 3131
>
>
>
>
>
>
>
>
> 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
>> > _________________________________________________________________
>> > Hotmail: Free, trusted and rich email service.
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>
>
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