Issues with A20

[tonystang2727]

Hi,
I bought several Lime2 and tested them.

Unfortunatelly, the GBit-Lan did not seem to work reliyable. Later ping tests revealed a packet loss

on many boards of 1% to 20%. (eg. "ping -s 9000 -i 0.0001 -c 5000 fritz.box"). Some boards dont have

any problems, other more. On heavy access with SSD it's increasing a little. It's happens also without

SSD. Other boards worked fine at the same power and network cable.



Its possible thant this strange TX_DELAY isn't set correctly? Are there other problems known?

I used the wheezy image with kernel 3.4.105-lime2 and 3.4.107 from you latest wheezy image.

The image with Kernal 4.0.4 stopped after "restarting sshd", so I couldnt test them.

Any thoughts? Can I adjust the TX-Delay timing without recompiling?



Thanks

[LubOlimex]

> I used the wheezy image with kernel 3.4.105-lime2 and 3.4.107 from you latest wheezy image.

I'm not sure if this is true. As far as I know we don't recommend Wheezy images for LIME2. Also we don't have an official image with kernel 3.4.105, nor with 3.4.107. The recommended images are Jessie ones with kernel 3.4.103.

For boards with eMMC, please test with this image: https://www.olimex.com/wiki/images/c/cc/A20-lime2_mainline_uboot_sunxi_kernel_3.4.103_jessie_eMMC_rel_16.torrent

For boards with NAND, please test with this image:
https://www.olimex.com/wiki/images/2/24/A20-lime2_mainline_uboot_sunxi_kernel_3.4.103_jessie_NAND_rel_13.torrent

If the problem persists, please provide me with the following details so I can replicate it here:

1. Can you provide me a link to to the torrent file of the official image that you test with?

2. Tell me which variant and hardware revision of A20-OLinuXino-LIME2 exactly do you have?

I will test at the same terms once I know more.

[lambda]

Hi,

with the cedrus driver (video engine) accepted for kernel 4.20 I think mainline support for the A20 is essentially complete. (Unless you care about the camera interface that isn't used on the LIME2 AFAIK or audio on HDMI). The only relevant missing bit is VGA output from the display engine. (VGA still needs simple framebuffer). See http://linux-sunxi.org/Linux_mainlining_effort

Anyway, I recommend testing the mainline kernel for your problems. Likely they will go away as the mainline kernel is of much higher quality then the BSP kernel. (Which also is the reason it takes so very long to develop.)

HTH,
Harald