Hi Peter, On Wed, Jul 11, 2018 at 10:01 AM Peter Robinson pbrobinson@gmail.com wrote:
On Tue, Jul 10, 2018 at 9:37 PM, Belisko Marek marek.belisko@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@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@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/e9af481cbc21bba1d4447a5a4bd1674c40d61... 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