[U-Boot] Beagle-XM: u-boot SPL fat support (was Re: [opensuse-arm] Beagleboard Xm CPU speed)
Tom Rini
trini at ti.com
Fri May 10 20:51:09 CEST 2013
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On 05/10/2013 02:31 PM, Alexander Graf wrote:
>
> On 19.03.2013, at 23:12, Tom Rini wrote:
>
>> On 03/19/2013 03:53 PM, Alexander Graf wrote:
>>>
>>> On 19.03.2013, at 18:01, Nishanth Menon wrote:
>>>
>>>> Change in subject. Original thread start:
>>>> http://lists.opensuse.org/opensuse-arm/2013-03/msg00076.html
>>>>
>>>> On 17:15-20130319, Guillaume Gardet wrote:
>>>>>
>>>>> Le 19/03/2013 17:04, Nishanth Menon a йcrit :
>>>>>> On 08:47-20130319, gary wrote:
>>>>>>> Just a FYI, here is the the boot text dumped to the
>>>>>>> serial port. It indicates a 1GHz max clock rate, but
>>>>>>> maybe that is just a "capability" of the board (as in
>>>>>>> a designation) and not a parameter that has been set.
>>>>>>>
>>>>>>> I see in the boot text there is a way to interrupt the
>>>>>>> automatic boot, which I presume is a way to set
>>>>>>> parameters. Could someone give me what such a line
>>>>>>> would look like for forcing the mpurate?
>>>>>>>
>>>>>>> --------------------------------------- Texas
>>>>>>> Instruments X-Loader 1.5.0 (Sep 8 2012 - 02:21:18)
>>>>>>> Beagle xM Reading boot sector Error: reading boot
>>>>>>> sector fat load failed, trying ext2 Loading u-boot.bin
>>>>>>> from mmc
>>>>>> Why are we still using old x-loader - we should be using
>>>>>> SPL MLO from u-boot master - it works straight on
>>>>>> beagleXM.
>>>>>
>>>>> Our last tests with SPL and latest u-boot were
>>>>> unsuccessful! And we have to port ext2 support to it
>>>>> because we have no FAT partition.
>>>> Quote from an internal query I just did: "There shouldn't be
>>>> a case where xM has memory that X-Loader works for that SPL
>>>> did not.
>>>
>>> The issue was that with SPL and proper upstream u-boot from
>>> ~fall last year, my beagleboard xm was unstable. It constantly
>>> crashed. So I reverted back to the old x-loader booting, as
>>> that kept things stable.
>>
>> If you can try current U-Boot or provide more details about the
>> instability I'd appreciate it.
>
> Alrighty, we switched all images to upstream SPL now. Let's see
> what happens :).
Yay!
>>>> There _may_ be a UART issue that needs work-arounding
>>>> however. And of course if they used mainline they could
>>>> pretty easily do RAW for SPL/U-Boot.img and then do
>>>> everything else with ext2/3/4 and ignore FAT.
>>>
>>> The "default" that we stuck with so far (though we can
>>> certainly change that) is to keep u-boot as a file in ext2, so
>>> that it can easily be updated. That maybe wasn't the most
>>> clever decision and going with raw is the way to go, but it's
>>> what we do today.
>>
>> That's fine and a decent idea. I'd be happy to review patches
>> to make this a clean option in SPL, even. A plus of moving to
>> mainline would be that ext4 is supported now too.
>
> Oh, with recent u-boot and the SPL approach for OMAP this already
> is a pretty clean option. You only need to enable the CMD defines
> and change the default bootcmd :).
You should just be able to provide a uEnv.txt with your custom
actual-boot command as uenvcmd. What CMD defines do you need? I'm
quite open to enabling more as needed for real world cases.
- --
Tom
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