From 274439b780f482fccd9077f9c9e8cfe9657950c3 Mon Sep 17 00:00:00 2001 From: Rosen Penev Date: Thu, 28 Mar 2019 23:01:30 -0700 Subject: [PATCH] ramips: Increase GB-PC2 SPI frequency to 80MHz MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The flash chip on the board (Spansion S25FL256SAIF00) is rated to support at least 50MHz for normal read requests according to the datasheet. 133MHz for fast reads. However, ramips seems to be limited to 80MHz. >From testing this, higher values do not improve speeds. time dd if=/dev/mtdblock3 of=/dev/null bs=64k from 42.82s to 14.09s. boot speed is also faster: [ 66.884087] procd: - init - vs [ 48.976049] procd: - init - Since spi speed was requested: [ 3.538884] spi-mt7621 1e000b00.spi: sys_freq: 225000000 CPU is 900MHz: [ 0.000000] CPU Clock: 900MHz Signed-off-by: Rosen Penev [fixed commit message by adding missing 0 in the spi-mt7621 clock output] Signed-off-by: Petr Štetiar --- target/linux/ramips/dts/GB-PC2.dts | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/target/linux/ramips/dts/GB-PC2.dts b/target/linux/ramips/dts/GB-PC2.dts index 32b6f9838f..dff1b3d5f7 100644 --- a/target/linux/ramips/dts/GB-PC2.dts +++ b/target/linux/ramips/dts/GB-PC2.dts @@ -81,7 +81,8 @@ m25p80@0 { compatible = "jedec,spi-nor"; reg = <0>; - spi-max-frequency = <10000000>; + spi-max-frequency = <80000000>; + m25p,fast-read; partitions { compatible = "fixed-partitions";