Grant Likely wrote: > On Mon, Jan 12, 2009 at 2:07 AM, <florian.bel...@freenet.de> wrote: >> hello, >> >> I have some problems with an mpc5200b based board. It's nearly compatible to >> the lite5200b board. >> I connected an samsung k9k8g08u0a nand flash via the lpb bus. This works >> fine with an self written nand driver. >> Now I try to use the standard nand driver from linux and configure it via >> the dts file. But this doesn't work and I get >> the following output: >> >> n...@1,0 { //cs1 >> compatible = "samsung, k9k8g08u08", "cfi-flash"; > ^^^^^^^^^ > > NAND Flash is not a CFI flash device. The cfi-flash driver won't work with > it. > >> Now my questions are: >> Is there any error in the dts configuration? >> Is it principle posible to configure a nand flash via the dts file (in >> combination with mpc5200b)? > > It is possible to *describe* the NAND flash via the dts file. The dts > file doesn't configure anything. It just describes the hardware > layout so that you can write or bind the appropriate driver to the > device. I don't know if a device tree binding has been defined for > NAND flash yet.
I find 3 MTD NAND drivers with OF bindings in linux-2.6/drivers/mtd/nand $ grep -l of_device *.c fsl_elbc_nand.c fsl_upm.c pasemi_nand.c The bindings for the FSL UPM are described in http://lxr.linux.no/linux+v2.6.28/Documentation/powerpc/dts-bindings/fsl/upm-nand.txt. Something similar is needed for his board (NAND connected to lpb) as well. >> I read in some forums that the nand flash must be activated in the u-boot >> before it can be configured via dts. > > You definitely need to set up the CS line for the NAND before using it > in Linux. Typically this is done in U-Boot, but in a pinch it can be > done in the platform support code (arch/powerpc/platforms/52xx/*) Yep, and also the R/B pin should be handled somehow, preferably using the OF GPIO interface. Wolfgang. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev