A20 emmc bad read/write

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hello
is there anyone using an eMMC (not and sdcard) with an A20 board ?

I'm trying to use the on-board eMMC of a a20-olinuxino-lime2-emmc. The
emmc is detected properly:
[     2.173651] ld1 at sdmmc1: <0x15:0x0100:AGND3R:0x00:0x783ff444:0x000>
[     2.173651] ld1: 14910 MB, 7573 cyl, 64 head, 63 sec, 512 bytes/sect x 30535680 sectors
[     2.193661] ld1: 4-bit width, DDR52, 64 MB cache, 52.000 MHz

(the size matches the datasheet, and the CID looks OK).
But when I try to use it the data are corrupted. More specifically,
odd bytes are repeaed and even bytes are lost.
For example if I write to the raw device 1234567890, I get back
1133557799:
armv7# cat /tmp/f
1234567890
armv7# dd if=/tmp/f of=/dev/rld1c conv=sync
0+1 records in
1+0 records out
512 bytes transferred in 0.002 secs (256000 bytes/sec)
armv7# dd if=/dev/rld1c count=1|less
1+0 records in
1+0 records out
512 bytes transferred in 0.001 secs (512000 bytes/sec)
1133557799

(and 2 \n instead of one).

before I start looking closer, does it ring a bell to someone ?

The DTS has an entry
broken-hpi
for the emmc, to uncoditionally disable the HPI feature. AFAIK we don't try to
use this feature at all, so ignoring this should not be the problem.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--