[U-Boot] Ethernet problem on A20 Lime2

[Hans de Goede <hdegoede@redhat.com>]

Hi Tom,

On 21-04-15 16:03, Tom Rini wrote:
> Hey,
>
> I've run into a problem with ethernet on the A20 Lime2:
> sunxi# setenv autoload no
> sunxi# dhcp
> Speed: 1000, full duplex
> BOOTP broadcast 1
> DHCP client bound to address 192.168.0.185 (13 ms)
> sunxi# tftp test/u-boot-sunxi-with-spl.bin
> Speed: 1000, full duplex
> Using dwmac.1c50000 device
> TFTP from server 192.168.0.3; our IP address is 192.168.0.185
> Filename 'test/u-boot-sunxi-with-spl.bin'.
> Load address: 0x42000000
> Loading: #################################################################
>           #########
>           23.4 KiB/s
> done
> Bytes transferred = 377028 (5c0c4 hex)
> sunxi# crc32 $fileaddr $filesize
> CRC32 for 42000000 ... 4205c0c3 ==> afa0edfb
> $ rhash -C /tftpboot/test/u-boot-sunxi-with-spl.bin
> ; Generated by RHash v1.2.8 on 2015-04-21 at 10:01.53
> ; Written by Aleksey (Akademgorodok) - http://rhash.sourceforge.net/
> ;
> ;       377028  09:52.08 2015-04-21 /tftpboot/test/u-boot-sunxi-with-spl.bin
> /tftpboot/test/u-boot-sunxi-with-spl.bin A16F5564
>
> So a non-crc32 match.  If I load that same file off of SD card:
> sunxi# mmc read 43000000 10 400
>
> MMC read: dev # 0, block # 16, count 1024 ... 1024 blocks read: OK
> sunxi# cmp 42000000 43000000 $filesize
> word at 0x42001544 (0x605a0200) != word at 0x43001544 (0x605a0201)
> Total of 1361 word(s) were the same
>
> I haven't had a chance to bisect this but it might have been around for
> a little while.

Chances are this has never worked 100% reliable, on most boards some
tweaking of the GMAC clk delays is necessary.

Try setting

CONFIG_GMAC_TX_DELAY=1

In the defconfig for your board, that helps with similar issues on
the Cubietruck (which also has gbit ethernet) Valid values are
0 - 3.

Regards,

Hans