[U-Boot] raspberrypi compute module3 emmc not usable

[Belisko Marek]

Hi Jonathan,

On Wed, Jul 11, 2018 at 3:11 AM Jonathan Gray <jsg at jsg.id.au> wrote:
>
> On Tue, Jul 10, 2018 at 10:37:19PM +0200, Belisko Marek 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.
>
> You should give 2018.07 a try, which includes a change for a problem
> reported by someone with a CM3.
>
> commit 79fd08f7456c7d12b04ef39e51d84d9981599c3a
> Author: Alexander Graf <agraf at suse.de>
> Date:   Wed May 23 22:24:51 2018 +0200
>
>     mmc: Unirqify bcm2835_sdhost and fix writes
>
>     The bcm2835 sdhost driver has a problem with "write multiple" commands.
>     It seems to boil down to the fact that the controller dislikes its FIFO
>     to get drained at the end of a block when a write multiple blocks command
>     is in flight.
>
>     The easy fix is to simply get rid of all the IRQ driven logic and make
>     the driver push as much data into the FIFO as it can. That way we never
>     drain and we never run into the problem.
>
>     Reported-by: Jan Leonhardt <jan at cyberdesigner.net>
>     Signed-off-by: Alexander Graf <agraf at suse.de>
>
>  drivers/mmc/bcm2835_sdhost.c | 265 ++++++++++--------------------------------------------
>  1 file changed, 47 insertions(+), 218 deletions(-)

tried but looks like result is same:
U-Boot 2018.07-dirty (Jul 11 2018 - 03:14:31 +0000)

DRAM:  948 MiB
RPI Compute Module 3 (0xa220a0)
MMC:   sdhci at 7e300000: 0
Loading Environment from FAT... ** 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> mmc dev
unable to select a mode
switch to partitions #0, OK
mmc0(part 0) is current device
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

MMC read: dev # 0, block # 0, count 2 ... 0 blocks read: ERROR
U-Boot>

Thanks and BR,

marek

-- 
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Marek Belisko - OPEN-NANDRA
Freelance Developer

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