On Tue, May 13, 2014 at 10:55:33AM +0200, Holger Schurig wrote:
> Hi,
>
> my device has an SPI NOR flash Micron N25Q512A13G124F. With the patch
> below it get's detected by barebox and I can at least dump it ("md -s
> /dev/m25p0).
>
> Before submitting that patch with signed-off, I want however first
> test SPI. It works a but, but only so far:
>
> barebox:/ unprotect /dev/m25p0
> barebox:/ erase /dev/m25p0
> barebox:/ erase /dev/m25p0.barebox-environment
> barebox:/ saveenv
> saving environment
> could not open /dev/env0: Read-only file system
> saveenv: Read-only file system
>
> So, what am I missing to connect /dev/env0 by default?
>
> And, when I do this:
>
> barebox:/ saveenv /dev/m25p0.barebox-environment
> saving environment
>
> it seems that it just wrote 00's (before it was FF's, because of the erase):
>
> barebox:/ md -s /dev/m25p0.barebox-environment
> 00000000: 00000000 00000000 00000000 00000000 ................
> 00000010: 00000000 00000000 00000000 00000000 ................
> 00000020: 00000000 00000000 00000000 00000000 ................
> 00000030: 00000000 00000000 00000000 00000000 ................
> 00000040: 00000000 00000000 00000000 00000000 ................
> 00000050: 00000000 00000000 00000000 00000000 ................
> 00000060: 00000000 00000000 00000000 00000000 ................
> 00000070: 00000000 00000000 00000000 00000000 ................
> 00000080: 00000000 00000000 00000000 00000000 ................
> 00000090: 00000000 00000000 00000000 00000000 ................
> 000000a0: 00000000 00000000 00000000 00000000 ................
> 000000b0: 00000000 00000000 00000000 00000000 ................
> 000000c0: 00000000 00000000 00000000 00000000 ................
> 000000d0: 00000000 00000000 00000000 00000000 ................
> 000000e0: 00000000 00000000 00000000 00000000 ................
> 000000f0: 00000000 00000000 00000000 00000000 ................
>
> Now, perhaps I must add something to the device tree? When I do ...
>
> chosen {
> # ...
> environment@0 {
> compatible = "barebox,environment";
> device-path = &flash, "partname:barebox-environment";
> };
> };
>
> &ecspi3 {
> flash: spiflash@0 {
> #address-cells = <1>;
> #size-cells = <1>;
> compatible = "m25p80";
> spi-max-frequency = <20000000>;
> reg = <0>;
>
> partition@0 {
> label = "barebox-environment";
> reg = <0x0 0x40000>;
> };
> };
> };
This looks perfectly fine.
>
> then I get a backtrace at boot:
>
> detected i.MX6 Quad revision 1.2
> mdio_bus: miibus0: probed
> m25p80 spiflash@00: mr25h256 (32 Kbytes)
This is your problem. Your device is detected as a 32KB mr25h256 instead
of the n25q512 you really have. Have you seen
http://lists.infradead.org/pipermail/linux-mtd/2014-January/051382.html?
> partition m25p0.barebox-environment not completely inside device m25p0
You define a 256k environment partition in the devicetree, but your
(wrongly detected) device has only 32k.
> unable to handle paging request at address 0xfffffff2
Of course barebox shouldn't crash here, that seems to be a bug.
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
