[U-Boot] [PATCH] Add CONFIG_GMAC_TX_DELAY=4 for OlinuXino Lime2

[Michael Haas <haas@computerlinguist.org>]

Hello all,


On 03/16/2016 09:36 PM, Karsten Merker wrote:
> Michael, if you would like to try testing higher RX delay chain values
> on the Lime2, I have attached a small patch that adds an appropriate
> Kconfig option. Regards, Karsten 

I will be testing your patch along with Hans' patch. In fact, I have
already compiled it - I'm just waiting for a new SD card reader to
arrive tomorrow. Sorry for the delay.

In the mean time, as I was trying to get the device to boot at all (not
related to u-boot, just my broken sdcard setup), I did try my old SD
card again to load the debian netinstaller. This should be the version
with the TX_DELAY set to 4.

Now I'm sitting in an ash shell and I can wget files from my desktop at
around 100MB/s.


~ # wget http://192.168.1.170:8000/debian-8.3.0-i386-netinst.iso -O - |
md5sum
Connecting to 192.168.1.170:8000 (192.168.1.170:8000)
-                    100% |*******************************|   315M 
0:00:00 ETA
37f329724a1c072cbe0ebda211fdeb88  -
~ # wget http://192.168.1.170:8000/debian-8.3.0-i386-netinst.iso -O - |
md5sum
Connecting to 192.168.1.170:8000 (192.168.1.170:8000)
-                    100% |*******************************|   315M 
0:00:00 ETA
37f329724a1c072cbe0ebda211fdeb88  -

~ # date +%s; wget
http://192.168.1.170:8000/debian-8.3.0-i386-netinst.iso -O /d
ev/null; date +%s
1258
Connecting to 192.168.1.170:8000 (192.168.1.170:8000)
null                 100% |*******************************|   315M 
0:00:00 ETA
1261

~ # dmesg | grep -i link
[    1.504918] audit: initializing netlink subsys (disabled)
[   88.561822] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[   90.547368] sun7i-dwmac 1c50000.ethernet eth0: Link is Up -
1Gbps/Full - flow control rx/tx
[   90.547424] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

~ # cat /etc/lsb-release
DISTRIB_ID=Debian
DISTRIB_DESCRIPTION="Debian GNU/Linux installer"
DISTRIB_RELEASE="9 (stretch) - installer build 20160316-00:13"
X_INSTALLATION_MEDIUM=netboot
~ # uname -a
Linux debian 4.4.0-1-armmp #1 SMP Debian 4.4.4-2 (2016-03-09) armv7l
GNU/Linux



It takes around three seconds (date +%s; time not set) to transfer the
315MB. The md5sum matches.

Now, with the device sitting on my desk in a debian installer session
and working gbit.. how do I proceed from here? I don't dare rebooting..

Best

Michael