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Date: Thu, 22 May 2014 20:46:56 +0900 (JST)
Message-Id: <20140522.204656.144162099.toshi@ruby.ocn.ne.jp>
To: smith.winston.101@gmail.com
Subject: Re: BBB MMC / SD detection instability with U-Boot 2014.04 (CPU 1GHz)
From: SAITOU Toshihide <toshi@ruby.ocn.ne.jp>
In-Reply-To: <CADH-AwGb36EUknNofdch1Q4Pn8GAN+Ep9SdiJ_f7Q2v9e4kW1g@mail.gmail.com>
References: <20140521.214356.02299991.toshi@ruby.ocn.ne.jp>
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In message: <CADH-AwGb36EUknNofdch1Q4Pn8GAN+Ep9SdiJ_f7Q2v9e4kW1g@mail.gmail.com>
            Winston Smith <smith.winston.101@gmail.com> writes:
> On Wed, May 21, 2014 at 11:20 AM, SAITOU Toshihide <toshi@ruby.ocn.ne.jp> wrote:
>> If abort like
>>
>>   musbotg0: TI AM335X USBSS v0.0.13
>>   Fatal kernel mode data abort: 'External Non-Linefetch Abort (S)'
>>   trapframe: 0xc0a2eb60
> 
> I see this with the 1Ghz uboot, it occurs about 50% of the time, see:
> 
> http://comments.gmane.org/gmane.os.freebsd.devel.arm/8200

Although it is an ad hoc workaround but ``usb start'' at u-boot command
prompt (someone mentioned before) or add device_printf("!\n") before
``rev = USBSS_READ4(sc, USBSS_REVREG);'' in the musbotg_attach of
am335x_usbss.c prevent this panic for me.

Anyway I understand my procedure is workaround, and is working by
chance or side effect, but eMMC boot and 1000 MHz operation is fun.

-- 
SAITOU Toshihide