| Message ID | 20170117125742.9536-1-fparent@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Fabien Parent <fparent@baylibre.com> writes: > Read access to the SPI flash are broken on da850-evm, i.e. the data > read is not what is actually programmed on the flash. > According to the datasheet for the M25P64 part present on the da850-evm, > if the SPI frequency is higher than 20MHz then the READ command is not > usable anymore and only the FAST_READ command can be used to read data. > > This commit specifies in the DTS that we should use FAST_READ command > instead of the READ command. > > Signed-off-by: Fabien Parent <fparent@baylibre.com> Tested on da850-evm on top of v4.10-rc3. This gets the DT boot functionatliy in line with the legacy (board-file) boot. Tested-by: Kevin Hilman <khilman@baylibre.com> Kevin
On Wednesday 18 January 2017 05:55 AM, Kevin Hilman wrote: > Fabien Parent <fparent@baylibre.com> writes: > >> Read access to the SPI flash are broken on da850-evm, i.e. the data >> read is not what is actually programmed on the flash. >> According to the datasheet for the M25P64 part present on the da850-evm, >> if the SPI frequency is higher than 20MHz then the READ command is not >> usable anymore and only the FAST_READ command can be used to read data. >> >> This commit specifies in the DTS that we should use FAST_READ command >> instead of the READ command. >> >> Signed-off-by: Fabien Parent <fparent@baylibre.com> > > Tested on da850-evm on top of v4.10-rc3. This gets the DT boot > functionatliy in line with the legacy (board-file) boot. > > Tested-by: Kevin Hilman <khilman@baylibre.com> Applied with Kevin's Tested-by and also marked for stable. Sending pull request for v4.10-rc shortly. Thanks, Sekhar
diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts index 41de15fe15a2..78492a0bbbab 100644 --- a/arch/arm/boot/dts/da850-evm.dts +++ b/arch/arm/boot/dts/da850-evm.dts @@ -99,6 +99,7 @@ #size-cells = <1>; compatible = "m25p64"; spi-max-frequency = <30000000>; + m25p,fast-read; reg = <0>; partition@0 { label = "U-Boot-SPL";
Read access to the SPI flash are broken on da850-evm, i.e. the data read is not what is actually programmed on the flash. According to the datasheet for the M25P64 part present on the da850-evm, if the SPI frequency is higher than 20MHz then the READ command is not usable anymore and only the FAST_READ command can be used to read data. This commit specifies in the DTS that we should use FAST_READ command instead of the READ command. Signed-off-by: Fabien Parent <fparent@baylibre.com> --- arch/arm/boot/dts/da850-evm.dts | 1 + 1 file changed, 1 insertion(+)