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

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

Hi,

On 17-03-16 06:28, Michael Haas wrote:
> 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..

There are 3 things which would be interesting to save and compare
with a boot which does have the problem:

1) The gmc clk register, to do this download mmio_dump from:

https://fedorapeople.org/~jwrdegoede/mmio-dump

And as root run:

./mmio-dump 0x1c20164

And record the output

This is a statically linked binary (I use it on android) so it
should work fine. If you don't like running $random binaries
of the internet, you can find the c-code here:

https://fedorapeople.org/~jwrdegoede/mmio-dump.c

Compile this (on the arm-system) with:

gcc -o mmio-dump mmio-dump.c

2) The pmic settings for various ldo-s, etc. as root run:

i2cdump -f -y 0 0x34

And record the output. You may need to
install i2c-tools (or the deb. alternative) and
do "modprobe i2c_dev"

3) The phy settings, unfortunately I do not know of
a way to dump these, so lets just forget about these
and focus on the other 2.

Regards,

Hans





>
> Best
>
> Michael
>
>
>
>
>