Hi,
I am trying to get a MTD running on my embedded PowerPC board. I am using a
Xilinx Virtex4 with an embedded PowerPC 405. In the FPGA there is a Xilinx SPI
controller implemented to which a Spansion S25FL128 SPI-flash (16MB) is
connected.
The problem is that with my setup the flash chips gets not detected and the MTD
partitions won't be setup.
In the kernel config I have configured the following options:
In the device drivers section:
[x] SPI support
[x] Xilinx SPI controller
[x] Memory Technology Device (MTD) support
[x] MTD partitioning support
[x] Flash partition map based on OF description
RAM/ROM/Flash chip drivers
[x] Detect non-CFI AMD/JEDEC-compatible flash chips
Self-contained MTD device drivers
[x] Support most SPI Flash chips (AT26DF, M25P, W25X, ...)
As filesystem I have configured JFFS2.
In my device tree I have declared the SPI controller and the connected flash as
follows:
SPI_Flash: xps-...@83400000 {
compatible = "xlnx,xps-spi-2.00.b";
interrupt-parent = <&int_ctrl>;
interrupts = < 3 2 >;
reg = < 0x83400000 0x10000 >;
xlnx,family = "virtex4";
xlnx,fifo-exist = <0x0>;
xlnx,num-offchip-ss-bits = <0x1>;
xlnx,num-ss-bits = <0x1>;
xlnx,sck-ratio = <0x20>;
#address-cells = <1>;
#size-cells = <1>;
nor_fl...@0,1000000 {
compatible = "amd,s25sl12800", "jedec-flash";
reg = <0x0 0x1000000>;
spi-max-frequency = <25000000>;
bank-width = <1>;
device-width = <1>;
#address-cells = <1>;
#size-cells = <1>;
roo...@800000 {
label = "rootfs";
reg = <0x800000 0x800000>;
};
};
};
When the kernel boots I can see from the console that the drivers for JFFS2 and
the SPI controller get successfully loaded:
...
JFFS2 version 2.2. (NAND) (c) 2001-2006 Red Hat, Inc.
...
xilinx-xps-spi 83400000.xps-spi: at 0x83400000 mapped to 0xC9060000, irq=17
...
While debugging the boot process I couldn't see any calls to jedec_probe()
resp. m25p_probe() from m25p80.c which to my understanding should be called in
result to a successfull match of my compatible property (jedec-flash).
The question is: What am I missing? Is there a problem with my device tree
definition? What else am I doing wrong?
Any help is appreciated. Regards,
Matthias.
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