[U-Boot] raspberrypi compute module3 emmc not usable

[Belisko Marek]

Hi Peter,
On Wed, Jul 11, 2018 at 10:01 AM Peter Robinson <pbrobinson at gmail.com> wrote:
>
> On Tue, Jul 10, 2018 at 9:37 PM, Belisko Marek <marek.belisko at gmail.com> wrote:
> > Hello,
> >
> > I'm trying to use u-boot on CM3 (which contains eMMC) to boot kernel.
> > I'm using u-boot 2018.05 and it can start fine like:
> > U-Boot 2018.05 (Jul 10 2018 - 20:32:05 +0000)
> >
> > DRAM:  948 MiB
> > RPI Compute Module 3 (0xa220a0)
> > MMC:   sdhci at 7e300000: 0
> > Loading Environment from FAT... unable to select a mode
> > ** No partition table - mmc 0 **
> > Failed (-5)
> > In:    serial
> > Out:   vidconsole
> > Err:   vidconsole
> > Net:   No ethernet found.
> > starting USB...
> > USB0:   scanning bus 0 for devices... 1 USB Device(s) found
> >        scanning usb for storage devices... 0 Storage Device(s) found
> > Hit any key to stop autoboot:  0
> > U-Boot>
> > U-Boot>
> > U-Boot>
> > U-Boot> mmc info
> > Device: sdhci at 7e300000
> > Manufacturer ID: 15
> > OEM: 100
> > Name: 4FPD3
> > Bus Speed: 52000000
> > Mode : MMC legacy
> > Rd Block Len: 512
> > MMC version 5.0
> > High Capacity: Yes
> > Capacity: 3.6 GiB
> > Bus Width: 1-bit
> > Erase Group Size: 512 KiB
> > HC WP Group Size: 8 MiB
> > User Capacity: 3.6 GiB WRREL
> > Boot Capacity: 4 MiB ENH
> > RPMB Capacity: 512 KiB ENH
> > U-Boot> mmc part
> > ## Unknown partition table type 0
> > U-Boot> mmc read $loadaddr 0 2
> >
> > but reading from eMMC fails with:
> >
> > MMC read: dev # 0, block # 0, count 2 ... 0 blocks read: ERROR
> >
> > so it looks like eMMC is not properly working with CM3 in this
> > version? Any ideas what to check to have it working before I dig to
> > debugging session ;). Thanks.
>
> I'm sure there was a patch series explicitly enabling the CM3 and
> associated IO board but I don't see it in git or my inbox but maybe my
> search fu is off this morning. There is a patch series landing in 4.19
> with support for it [1] so I suspect it'll be worthwhile someone
> looking at proper support for it in u-boot too.
Patch https://github.com/anholt/linux/commit/e9af481cbc21bba1d4447a5a4bd1674c40d619a1
add support for CM1 which is different processor but IIRC CM3 support
is already in u-boot except eMMC is not working, so probably I dig to
that area ;).
>
> [1]  http://lists.infradead.org/pipermail/linux-rpi-kernel/2018-July/007651.html

BR,

marek

-- 
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Marek Belisko - OPEN-NANDRA
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