[OpenWrt-Devel] [PATCH] ramips: Increase GB-PC2 SPI speed to 50MHz

Chuanhong Guo gch981213 at gmail.com
Sun Feb 10 23:59:32 EST 2019

On Mon, Feb 11, 2019 at 7:49 AM Rosen Penev <rosenp at gmail.com> wrote:
> [...]
> On the PC1, I can go even higher with the SPI frequency to get better
> performance. However, the later versions of the PC1 switched flash
> chips to Spansion to avoid a restart bug. Those are documented as
> accepting 50MHz for read requests.

FYI: I haven't check the Spansion datasheet, but when Winbond
datasheets say read instruction accepts SPI clock up to 50MHz it
refers to the normal read instruction (0x03) and for higher clock you
should switch to fast read instruction (0x0B) which can be done by
adding m25p,fast-read to dts. I guess the situation with Spansion
datasheets are the same.

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