Hi,

I've had some further discussion on this with another B3 owner.
According to an old patch that Excito corporation built for kernel
version 2.6 the flash memory is in fact a Numonyx MP25P16
The driver however must be m25p80.

It would therefore seem cleaner to just correct the driver reference
and leave the label as is. The patch thus becomes:

Signed-off-by: Gordon Bos <gordon@bosvangennip.nl>
---
 arch/arm/boot/dts/kirkwood-b3.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/kirkwood-b3.dts b/arch/arm/boot/dts/kirkwood-b3.dts
index c9247f8..5c6e8d3 100644
--- a/arch/arm/boot/dts/kirkwood-b3.dts
+++ b/arch/arm/boot/dts/kirkwood-b3.dts
@@ -74,7 +74,7 @@
 			m25p16@0 {
 				#address-cells = <1>;
 				#size-cells = <1>;
-				compatible = "st,m25p16";
+				compatible = "st,m25p80";
 				reg = <0>;
 				spi-max-frequency = <40000000>;
 				mode = <0>;
---

Regards,
Gordon Bos

On 02/06/2015 10:09 AM, Gregory CLEMENT wrote:

Excito B3 boards use SPI flash for booting and several userland functions require access to this flash memory, including power down control. However /proc/mtd shows an empty list and the userland tools respond with "device not found".

The change in arm/boot/dts don't go through the device tree subsystem but through the arm-soc one. Especially it it is only a fix and if you don't introduce or modifying a binding. For this kind of patch you should cc the mvebu maintainers (I added the others one) However it seems that the get_maintainer.pl script is misleading on this point we should maybe be updating the MAINTAINERS file.

This change looks OK for me however it is too late to merge it and it will be part of the next merge window. Andrew, as you initially wrote this dts would you have a look on it? As it is a fix we will also apply to the stable branches. It would help if you could tell us since when this bug is present. Thanks, Gregory

Signed-off-by: Gordon Bos <gordon@bosvangennip.nl> --- arch/arm/boot/dts/kirkwood-b3.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/boot/dts/kirkwood-b3.dts b/arch/arm/boot/dts/kirkwood-b3.dts index c9247f8..4b1e414 100644 --- a/arch/arm/boot/dts/kirkwood-b3.dts +++ b/arch/arm/boot/dts/kirkwood-b3.dts @@ -71,10 +71,10 @@ spi@10600 { status = "okay"; - m25p16@0 { + m25p80@0 { #address-cells = <1>; #size-cells = <1>; - compatible = "st,m25p16"; + compatible = "st,m25p80"; reg = <0>; spi-max-frequency = <40000000>; mode = <0>;