[OpenWrt-Devel] [PATCH] ramips: add support for ASUS RT-AC57U

[Chuanhong Guo]

Hi!

On Tue, Jun 25, 2019 at 5:23 PM Christian Lamparter <chunkeey at gmail.com> wrote:
> Is 10MHz even a supported frequency for the SPI-NOR chip?

It is supported. It's just unnecessarily slow. Mediatek uses 30MHz in
their SDK and all my boards works fine with 40MHz.

>
> I think you can measure the time it takes to read the SPI-NOR and check
> if the KiB/s match with the selected frequency or not.

Did a quick test on my router with 40MHz SPI clock:

# time dd if=/dev/mtdblock3 of=/dev/null bs=64k
251+0 records in
251+0 records out
real 0m 4.98s
user 0m 0.00s
sys 0m 0.16s

around 25Mbit/s


Regards,
Chuanhong Guo

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