On Thu, Sep 3, 2020 at 7:23 PM Stefan Agner stefan@agner.ch wrote:
Any thoughts on this issue?
Just to be sure, I did some memory testing on the 2GB module, but no issues found.
I still somehow suspected that something else might be wrong with my hardware, so I bought a new RPi4 (this time with 4GB of RAM) but the very same with that:
U-Boot 2020.01 (Aug 23 2020 - 22:02:31 +0000)
DRAM: 3.9 GiB
<freeze>
I still think there is something wrong with caching. From what I understand caches are enabled by the RPi (4) firmware. Is it safe to run 32-bit ARM U-Boot with enabled caches?
-- Stefan
On 2020-08-23 19:06, Stefan Agner wrote:
Hi,
I noticed a quite common freeze when running 32-bit U-Boot 2020.01 (rpi_4_32b_defconfig) on a 2GB RPi4 model:
U-Boot 2020.01 (Aug 07 2020 - 13:00:23 +0000)
DRAM: 1.9 GiB <freeze, no more output>
This happens fairly often, I would say 4 out of 5 boot tries. However, if it boots, everything seems to run fine.
The issue seems to go away when using 2020.04 or any newer release, however, when trying to find the actual patch fixing the issue using git bisect I ended up with a MMC merge request which really seems unrelated (36bdcf7f3b). It seems that the problem is quite evasive and disappears if certain structure are aligned differently etc.
Enabling initcall debugging showed that U-Boot crashes right after relocation:
I suspect there are some timing issues in the DDR training codes.
Regards, Bin