Re: [Ltib] Booting from SDHC

[Stuart Hughes]

Hi Carolyn,

fdisk is not in the public LTIB CVS, so you'll need to check with Freescale.

Regards, Stuart

Reer, Carolyn (SA-1) wrote:
> 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
>>
>>
>> ------------------------------------------------------------------------
>>
>> _______________________________________________
>> LTIB home page: http://ltib.org
>>
>> Ltib mailing list
>> address@hidden
>> http://lists.nongnu.org/mailman/listinfo/ltib