New u-boot-aspeed-sdk runs slow and cause wdt2 timeout on ast2500

[Thang Nguyen OS]

On 23/02/2022 09:15, Lei Yu wrote:
> On the latest master with u-boot-aspeed v00.04.09 SDK, an issue occurs
> on g220a that it runs slower than before and gets wdt2 timeout.
> We reverted the u-boot to a version before v00.04.09 SDK (b0fe8fd9d)
> and the issue is gone.
>
> Below are some details:
> * Before v00.04.09: u-boot works OK, and it takes about 9~10 seconds
> to load and start the kernel including the 2 seconds timeout for
> autoboot, the kernel starts OK and it kicks the watchdog as long as
> the driver is loaded.
> * With v00.04.09: u-boot runs slower than before, and it takes about
> **16 seconds** to load and start the kernel (including 2s timeout for
> autoboot), then the kernel does not have enough time to run and loads
> the watchdog driver, and the wdt2 times out on about 22s.
>
> Be noted that the issue is observed on g220a that is based on AST2500,
> and could not be reproduced in QEMU. I think it could be reproduced on
> other systems with AST2500.
>
I checked and saw the same issue with Ampere Mt.Jade. If I stop and 
u-boot prompt and disable watchdog via "mw 0x1e78502c 0", the command 
does not happen.