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ramips: reduce spi-max-frequency for ipTIME A8004T

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Reduce spi-max-frequency for ipTIME A8004T and disable
m25p,fast-read option.

A8004T uses `en25qh128` for the MTD.
This flash memory would allow 80MHz, sometimes kernel received
wrong id value in initramfs installed router.
(kernel expected `1c 70 18 1c 70 18`, but one of cases, it
was `9c 70 18 1c 70 18`)

In this case, openwrt can't detect the partition information,
it would write the inccorect data to the firmware partition and
also it would occur the bootlooping after sysupgrade.

Signed-off-by: Sunguk Lee <d3m3vilurr@gmail.com>
[minor commit title/message adjustments]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
This commit is contained in:
Sunguk Lee 2020-07-02 18:32:43 +09:00 committed by Adrian Schmutzler
parent 883250014d
commit 2d378703f1
1 changed files with 1 additions and 2 deletions
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3
target/linux/ramips/dts/mt7621_iptime_a8004t.dts
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@ -65,8 +65,7 @@
flash@0 { flash@0 {
compatible = "jedec,spi-nor"; compatible = "jedec,spi-nor";
reg = <0>; reg = <0>;
spi-max-frequency = <80000000>; spi-max-frequency = <50000000>;
m25p,fast-read;
partitions { partitions {
compatible = "fixed-partitions"; compatible = "fixed-partitions";