EM100Pro-G3 sporadically stops working

Corvin Köhne <[email protected]> Mon, 4 Mar 2024 13:43:43 +0000
Newsgroups	gmane.linux.bios
Message-ID	<[email protected]>
Hi,

I'm currently having some issues using the new EM100Pro-G3 and would
like to know if someone has seen such issues before and may have a
solution.

The EM100Pro-G3 sporadically stops working properly. I can reproduce
the issue within a few minutes by running the following steps in a
loop:

1. power off the board
2. em100 \
	--device EMxxxxxx \
	--stop \
	--set <chip> \
	--download <rom> \
	--verify \
	--start
3. power on the board
   * the board is configured to netboot a linux
4. wait until linux is reachable by ssh
5. goto 1

After some iterations, the board isn't able to boot any more. Even if I
power cycle the board, it doesn't boot. It doesn't even reach it's
first POST. Reloading the ROM into the EM100 (repeating step 2), solves
the issue.

I'm currently trying to gather more information about the issue. What I
do know right now:

1. Reloading the ROM without physically touching anything solves the
issue. 
2. It doesn't matter if I connect the USB connector + power adapter or
only the USB connector to the EM100Pro-G3.
3. I've recently exchanged the EM100Pro-G3 with the older EM100Pro-G2.
The board is running fine for several hours right now without any
issues.
4. If the board is unable to boot, `em100 --device EMxxxxxx --trace`
does return some data.

I don't think it's a physical issue, e.g. signal integrity issue, as
I'm not touching the whole system (see 1 + 2). I also don't think that
it's a sporadic issue of my ROM file as it's working with the old G2
(see 3). Maybe the ROM isn't loaded correctly into the EM100 which
causes it to return wrong data (see 1 + 4)?

As said, the board is currently connected to a G2. I'm going to keep
this test running for a while. If I can't reproduce the issue on the
G2, I'm going to switch back to the G3 and try to gather some more
information. What I'm going to check next is if the ROM returned by
`em100 --device EMxxxxxx --upload <rom>` matches the desired ROM.

Any help how to debug or solve this issue is highly appreciated!


-- 
Many thanks in advance,
Corvin

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