muram in device tree for mpc8250 in arch/powerpc

[James Black]

I am porting a proprietary mpc8250 board to 2.6.24. I have the 2.6.19
kernel from denx working. I have ported to u-boot 1.3.2 and have the
platform setup within the 2.6.24 kernel and used pq2fads.dts as an
example of the device tree.

Everything in u-boot is working. u-boot doesn't complain about the
device tree and fills in the clocks and memory using the "fdt
boardsetup" command. In fact, u-boot 1.3.2 can boot the 2.6.29 kernel,
no problem.

I turned on early kernel debugging in 2.6.24 and it looks like all the
device tree parsing is working. The boot hangs and or crashes while
trying to setup the paging. I drilled down the code from init/main.c
and found that it seems the muram device node is killing the
allocator.

I tried to fully describe the segments in muram node and it seems to
mess things up even worse. Can anyone give some pointers to help me
work out this issue?

I wanted to start with as simple a description as possible. The
following tree describes the flash, SDRAM, SCC1, SCC3 and FCC1.


/*
* Device Tree for the CTA5000S board with an MPC8250 chip.
* Device Tree for the PQ2FADS-ZU board with an MPC8280 chip.
*
* Copyright 2007 Freescale Semiconductor Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/

/ {

model = "cta5000s";
compatible = "fsl,cta5000s";
#address-cells = <1>;
#size-cells = <1>;
cpus {
#address-cells = <1>;
#size-cells = <0>;
PowerPC,8250 at 0 {
device_type = "cpu";
reg = <0>;
d-cache-line-size = <20>;
i-cache-line-size = <20>;
d-cache-size = <4000>;
i-cache-size = <4000>;
timebase-frequency = <0>;
clock-frequency = <0>;
};

};

memory {
device_type = "memory";
reg = <0 0>;
};

localbus at f0010100 {
compatible = "fsl,mpc8250-localbus",
"fsl,pq2-localbus";
#address-cells = <2>;
#size-cells = <1>;
reg = <f0010100 60>;
ranges = <0 0 fe000000 00200000>;
flash at fe000000,0 {
compatible = "amd", "cfi-flash";
reg = <0 fe000000 00200000>;
bank-width = <2>;
device-width = <1>;
};

};

soc at f0000000 {
#address-cells = <1>;
#size-cells = <1>;
device_type = "soc";
compatible = "fsl,mpc8250", "fsl,pq2-soc";
ranges = <00000000 f0000000 00014000>;
// Temporary -- will go away once kernel uses ranges for get_immrbase().
reg = <f0000000 00014000>;
cpm at 119c0 {
#address-cells = <1>;
#size-cells = <1>;
#interrupt-cells = <2>;
compatible = "fsl,mpc8250-cpm", "fsl,cpm2";
reg = <119c0 30>;
ranges;

muram at 0 {
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0 10000>;

data at 0 {
compatible = "fsl,cpm-muram-data";
reg = <0 4000 8000 4000>;
};

};

brg at 119f0 {
compatible = "fsl,mpc8250-brg",
"fsl,cpm2-brg",
"fsl,cpm-brg";
reg = <119f0 10 115f0 10>;
};

serial at 11a00 {
device_type = "serial";
compatible = "fsl,mpc8250-scc-uart",
"fsl,cpm2-scc-uart";
reg = <11a00 20 8000 100>;
interrupts = <28 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <1>;
fsl,cpm-command = <00800000>;
};

serial at 11a40 {
device_type = "serial";
compatible = "fsl,mpc8250-scc-uart",
"fsl,cpm2-scc-uart";
reg = <11a40 20 8200 100>;
interrupts = <2a 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <5>;
fsl,cpm-command = <11800000>;
};


ethernet at 11300 {
device_type = "network";
compatible = "fsl,mpc8250-fcc-enet",
"fsl,cpm2-fcc-enet";
reg = <11300 20 8400 100>;
interrupts = <20 8>;
interrupt-parent = <&PIC>;
linux,network-index = <0>;
fsl,cpm-command = <14000300>;
};

};

PIC: interrupt-controller at 10c00 {
#interrupt-cells = <2>;
interrupt-controller;
reg = <10c00 80>;
compatible = "fsl,mpc8250-pic", "fsl,cpm2-pic";
};

};

chosen {
linux,stdout-path = "/soc/cpm/serial at 11a00";
};

};