Date: Thu, 22 May 2014 20:39:23 +0900 (JST) From: SAITOU Toshihide <toshi@ruby.ocn.ne.jp> To: ian@FreeBSD.org Cc: freebsd-arm@FreeBSD.org Subject: Re: BBB MMC / SD detection instability with U-Boot 2014.04 (CPU 1GHz) Message-ID: <20140522.203923.240655619.toshi@ruby.ocn.ne.jp> In-Reply-To: <1400708280.1152.199.camel@revolution.hippie.lan> References: <537B62D1.4090901@hot.ee> <20140520.234245.38709064.toshi@ruby.ocn.ne.jp> <1400708280.1152.199.camel@revolution.hippie.lan>
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Ian Lepore <ian@FreeBSD.org> writes:
> On Tue, 2014-05-20 at 23:42 +0900, SAITOU Toshihide wrote:
>> In message: <537B62D1.4090901@hot.ee>
>> "Sulev-Madis Silber (ketas)" <madis555@hot.ee> writes:
>> > On 2014-05-20 15:20, SAITOU Toshihide wrote:
>> >> In message: <20140520.191001.03109216.toshi@ruby.ocn.ne.jp>
>> >> SAITOU Toshihide <toshi@ruby.ocn.ne.jp> writes:
>> >>> In message: <537ACDB2.9080808@hot.ee>
>> >>> "Sulev-Madis Silber (ketas)" <madis555@hot.ee> writes:
>> >>>>
>> >>>> Actually I guess many people might think like me... "HELL, optimizing
>> >>>> boot time of 1min?! I have more important tasks to do than this".
>> >>>
>> >>> If you have ``device sdhci'' line in conf/BEAGLEBONE, is there any
>> >>> differences by changing mmchs to sdhci in am335x.dtsi and
>> >>> beaglebone-black.dts? And also remove ``status = "disabled"''
>> >
>> > Don't edit am335x.dtsi
>> >
>> > And beaglebone-black.dts already has proper config.
>>
>> In this case, how does ``device sdhci'' driver know the register address?
>> I thought that there is an inconsistency in BEAGLEBONE config and
>> dts file for the SD/MMC driver.
>
> The name@address tag in the dts[i] files doesn't have to match the
> driver name in the kernel config. What matters for matching the driver
> to the right entry in the dts is the "compatible=" property. The
> ti_sdhci driver looks for an entry with any one of these compatible
> strings:
>
> "ti,omap3-hsmmc", "ti,omap4-hsmmc", "ti,mmchs"
Ah! I see ti_sdhci.c has ofw_bus_is_compatible(dev, "ti,mmchs").
(Why I felt difference of eMMC detection... Hmm...)
On the other hand, u-boot's MMC/SD driver has problem when using eMMC.
Crochet has patch for this. The card detection and init problem is
exist not only for FreeBSD but also u-boot's MMC operation.
--
SAITOU Toshihide
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