[BeagleBone Black Test PATCH 0/2] port latest u-boot

[Xuebing Wang]

1) I fixed the "kernel reboots every 50 seconds issue" by disable Watchdog.

AM335x Watchdog is enabled by below commit in mainline u-boot. It is 
written on Oct 1 2013.

commit 6843918e0035bf06cb65ad2b4c98b38e86e43bd5
Author: Tom Rini <trini at ti.com>
Date:   Tue Oct 1 12:32:04 2013 -0400

     am335x: Enable CONFIG_OMAP_WATCHDOG support

     There is a board-specific portion for calling watchdog enable 
itself, in
     main U-Boot.

     Signed-off-by: Tom Rini <trini at ti.com>

2) Do we consider to port the latest u-boot?


On 04/08/2014 09:06 PM, Ian Lepore wrote:
> On Mon, 2014-04-07 at 18:41 -0700, Tim Kientzle wrote:
>> On Apr 7, 2014, at 2:25 AM, Xuebing Wang <xbing6 at gmail.com> wrote:
>>
>>> Hi Tim and all,
>>>
>>> This is for discussion only. Would you please advice?
>>>
>>> This is motivated by trying to increase CPU frequency for BeagleBone Black.
>>>
>>> AM335x cpufreq is not supported yet. In order to achieve the goal to increase
>>> CPU freq, I am thinking of a 2-step approach:
>>> 1) port latest u-boot, which have cpufreq better organized
>>> 2) tweak u-boot opp/freq later
>> Setting the processor frequency after the OS is running
>> is not difficult.  The AM335x TRM shows exactly how to do it.
>>
>> I would not change U-Boot but rather implement
>> a FreeBSD driver that exposed a read/write sysctl
>> to reprogram the CPU frequency.
>>
>> Getting powerd to work with this should be straightforward.
>>
>> Tim
>>
> I agree with this, we should handle the frequency change in the kernel
> rather than in u-boot.
>
> On the other hand, I'm all for updating to a newer u-boot for other
> reasons.  I did that for imx6, updating to 2014.01 in place of the
> 2013.04 that wandboard was using, and it went well.  In fact, pretty
> much all I had to do was remove all the patches I had been using for
> 2013.04 except for turning on the API option and a couple other options.
> There apparently have been recent fixes to some of the API stuff, such
> as how storage devices are enumerated, which will help with the new
> features added to ubldr that let you choose which device to load the
> kernel from with u-boot env vars.
>
> -- Ian
>
>
>

-- 
Thanks,
Xuebing Wang