[U-Boot] [PATCH v5 0/7]

[Frank Kunz]

Am 25.01.2017 um 21:21 schrieb Marek Vasut:
> On 01/25/2017 06:33 PM, Dalon Westergreen wrote:
>> On Wed, 2017-01-25 at 08:39 -0600, Dinh Nguyen wrote:
>>>
>>> On 01/25/2017 03:48 AM, Marek Vasut wrote:
>>>>
>>>> On 01/25/2017 05:13 AM, Dalon Westergreen wrote:
>>>>>
>>>>> From: Dalon Westergreen <dalon.westergreen at intel.com>
>>>>>
>>>>> These patches update the boot and os partition numbers in
>>>>> the                   
>>>>> default uboot environment for a number of socfpga
>>>>> boards.  Per                  
>>>>> request, common environment configurations have been moved to
>>>>> a                 
>>>>> shared
>>>>> header.                                                                  
>>>>
>>>> OK, waiting for Acks from Dinh, just to be sure.
>>>>
>>>> btw a nit, please fill the $subject of cover letter next time.
>>>>
>>>>
>> I was just informed of an issue with moving the fat/boot partition
>> to p2.  Windows no longer mounts the fat partition.  I'm not sure 
>> who or why CONFIG_SYS_MMCSD_FS_BOOT_PARTITION was changed to 2
>> but i think in order to allow windows to mount the fat partition
>> it will need to be the first partition.  So i am going to change
>> CONFIG_SYS_MMCSD_FS_BOOT_PARTITION back to 1, and change the 
>> default env variables appropriately.  
> 
> You mean the layout is now:
> - p1 0x83
> - p2 0xa2
> - ...
> 
> I think this is really flaky, but I heard somewhere on the list that it
> is possible to write the u-boot-spl-with-dtb.sfp (without having actual
> 0xa2 partition) to offset 64 kiB and the machine will still boot. I am
> starting to consider using this approach as it will also allow distro
> bootcmd to work and distros to integrate altera boards.
> 

Yes, when

#define CONFIG_SPL_ABORT_ON_RAW_IMAGE

is set then the SPL will search for an u-boot image at the
CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR location on the MMC after a
failed scan for a 0xa2 partition. So with that option the uboot image
can be installed on the MMC by

dd if=u-boot-with-spl.sfp of=<disk> bs=64k seek=1 skip=1

With that the first 64KiB of the MMC are untouched, MBR/GPT for the OS
is preserved, and u-boot can start without 0xa2 partition.

Br,
Frank