RE: [Ltib] Booting from SDHC

[Reer, Carolyn (SA-1)]

Finally got the SDHC formatted today using someone's Ubuntu netbook computer.
I had no problem deleting the FAT16, adding a linux partition and saving using 
fdisk.
I haven't tried the SDHC in the MPC8536DS development set yet.
Have to be able to boot from it. That will be a whole new can of worms.

Is this a shortcoming of (fdisk) Freescale 2.6.28.... for PPC?
I have a newer LTIB that I haven't had a chance to try.

Carolyn

-----Original Message-----
From: Stuart Hughes [mailto:address@hidden 
Sent: Thursday, November 18, 2010 5:33 PM
To: Reer, Carolyn (SA-1)
Cc: ltib-users
Subject: Re: [Ltib] Booting from SDHC

Hi Carolyn,

Make sure write protect is not set (the tiny mechanical tab)

Also, you will probably need to format the SD card to something like
ext2 (or ext3/ext4 without a journal).

When booting, you need to tell the kernel to wait for the SD card, so
you'll need to add rootwait, for example:

root=/dev/mmcblk0p1 rw rootwait

Regards, Stuart

Reer, Carolyn (SA-1) wrote:
> Has anyone booted the kernel from SDHC card?
> 
> I have 2.6.28 kernel built for Freescale MPC8536E and booting from NFS.
> 
> I would like to copy the kernel & file system over to SD card to
> eliminate NFS from my Ethernet traffic timing tests.
> 
> I have tried 2-4GB SDHC cars and they are pre-formatted with W95 FAT16
> partitions.
> 
> I can mount the partition:
> 
> mount /dev/mmcblk0p1 /mnt/tmp/
> 
> But I can’t write to it.
> 
>  
> 
> I tried using fdisk to delete the partition and make a new linux
> partition; tried changing the FAT16 partition to linux partition.
> 
> But I can’t save the changes.
> 
>  
> 
> I was able to mount the drive:
> 
> mount /dev/mmcblk0 /mnt/tmp/
> 
> But I have less than 256MB to write to.
> 
>  
> 
> Thanks
> 
> Carolyn Reer
> 
> 
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