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
41.78s to 6.15s (with upstream SPI driver).
Signed-off-by: Rosen Penev <ros...@gmail.com>
---
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";
--
2.17.1
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