Hello,
I am working on a MPC8265 board which I have successfully ported Linux
Kernel 2.6.25 to. I am trying to upgrade the Kernel but have not got
good results (I am able to compile the Kernel for my powerpc, but not to
boot it). The problem appears to be something related to the interaction
between the dtb and the Kernel. I am not sure if the syntax for the dts
file may have changed from Kernel 2.6.25 to newer versions (I have tried
2.6.27.43 - 2.6.32.2 and 2.6.31.11 getting very similar results).
When I build the dtb file from the /arch/powerpc/boot/dts/MPC8272ADS.dts
file that comes with the new Kernel, the booting process gets stuck
after trying to load the device tree:
## Booting image at ff810000 ...
Image Name: Linux-2.6.27.43
Image Type: PowerPC Linux Kernel Image (gzip
compressed)
Data Size: 1365263 Bytes = 1.3 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
Booting using the fdt at 0xff802000
Loading Device Tree to 007fc000, end 007fefff ... OK
However, when I boot the new Kernel with the old compiled dtb file
(the one that works with the Kernel 2.6.25) the process moves forward
but stops at a time when displaying information about IRQ 40 line
(related to the Programmable Interrup Controller (PIC)):
## Booting image at ff810000 ...
Image Name: Linux-2.6.32.2
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 1431026 Bytes = 1.4 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image ... OK
Booting using the fdt at 0xff802000
Loading Device Tree to 007fc000, end 007fefff ... OK
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:setio
MMU:exit
Using Freescale PQ2FADS machine description
Linux version 2.6.32.2 (nirm...@localhost.localdomain) (gcc
version
4.2.1 (Sourcery G++ Lite 4.2-82)) #11 Wed Jan 13 15:54:33 EST
2010
bootconsole [udbg0] enabled
setup_arch: bootmem
pq2fads_setup_arch()
No fsl,pq2fads-bcsr in device tree
arch: exit
Top of RAM: 0x2000000, Total RAM: 0x2000000
Memory hole size: 0MB
Zone PFN ranges:
DMA 0x00000000 -> 0x00002000
Normal 0x00002000 -> 0x00002000
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
0: 0x00000000 -> 0x00002000
On node 0 totalpages: 8192
free_area_init_node: node 0, pgdat c02dfa18, node_mem_map
c0304000
DMA zone: 64 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 8128 pages, LIFO batch:0
Built 1 zonelists in Zone order, mobility grouping on. Total
pages: 8128
Kernel command line: console=ttyCPM0,9600 panic=10 root=1f03 rw
rootfstype=jffs2 mtdparts=physmap-flash.0:8K(reserved),56K(
fdt),1408K(uimab
PID hash table entries: 128 (order: -3, 512 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 29380k/32768k available (2824k kernel code, 3388k
reserved, 160k
data, 101k bss, 172k init)
Kernel virtual memory layout:
* 0xffffe000..0xfffff000 : fixmap
* 0xfe000000..0xfe000000 : early ioremap
* 0xc3000000..0xfe000000 : vmalloc & ioremap
SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1,
Nodes=1
Hierarchical RCU implementation.
NR_IRQS:512
No pci pic node in device tree.
time_init: decrementer frequency = 16.500000 MHz
time_init: processor frequency = 231.000000 MHz
clocksource: timebase mult[f26c9b2] shift[22] registered
clockevent: decrementer mult[4395810] shift[32] cpu[0]
Console: colour dummy device 80x25
irq: irq 40 on host /s...@f0000000/interrupt-control...@10c00
mapped to
virtual irq 40
I am attching below the MPC8272ADS.dts file that works for me for Kernel
2.6.25 (the dts file that I am trying to make work for newer Kernel):
/*
* 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 = "pq2fads";
compatible = "fsl,pq2fads";
#address-cells = <1>;
#size-cells = <1>;
cpus {
#address-cells = <1>;
#size-cells = <0>;
c...@0 {
device_type = "cpu";
reg = <0>;
d-cache-line-size = <d#32>;
i-cache-line-size = <d#32>;
d-cache-size = <d#16384>;
i-cache-size = <d#16384>;
timebase-frequency = <0>;
clock-frequency = <0>;
};
};
memory {
device_type = "memory";
reg = <0 0>;
};
s...@f0000000 {
#address-cells = <1>;
#size-cells = <1>;
device_type = "soc";
compatible = "fsl,mpc8280", "fsl,pq2-soc";
ranges = <00000000 f0000000 00053000>;
// Temporary -- will go away once kernel uses ranges
// for get_immrbase().
reg = <f0000000 00053000>;
c...@119c0 {
#address-cells = <1>;
#size-cells = <1>;
#interrupt-cells = <2>;
compatible = "fsl,mpc8280-cpm", "fsl,cpm2";
reg = <119c0 30>;
ranges;
mu...@0 {
#address-cells = <1>;
#size-cells = <1>;
ranges = <0 0 10000>;
d...@0 {
compatible = "fsl,cpm-muram-data";
reg = <0 2000 9800 800>;
};
};
b...@119f0 {
compatible = "fsl,mpc8280-brg",
"fsl,cpm2-brg",
"fsl,cpm-brg";
reg = <119f0 10 115f0 10>;
};
ser...@11a00 {
device_type = "serial";
compatible = "fsl,mpc8280-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>;
};
ser...@11a20 {
device_type = "serial";
compatible = "fsl,mpc8280-scc-uart",
"fsl,cpm2-scc-uart";
reg = <11a20 20 8100 100>;
interrupts = <29 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <2>;
fsl,cpm-command = <04a00000>;
};
ether...@11320 {
device_type = "network";
compatible = "fsl,mpc8280-fcc-enet",
"fsl,cpm2-fcc-enet";
reg = <11320 20 8500 100 113b0 1>;
interrupts = <21 8>;
interrupt-parent = <&PIC>;
phy-handle = <&PHY0>;
linux,network-index = <0>;
fsl,cpm-command = <16200300>;
local-mac-address = [00 e0 0a 03 79 01];
};
ether...@11340 {
device_type = "network";
compatible = "fsl,mpc8280-fcc-enet",
"fsl,cpm2-fcc-enet";
reg = <11340 20 8600 100 113d0 1>;
interrupts = <22 8>;
interrupt-parent = <&PIC>;
phy-handle = <&PHY1>;
linux,network-index = <1>;
fsl,cpm-command = <1a400300>;
local-mac-address = [00 e0 0c 00 79 01];
};
m...@10d40 {
device_type = "mdio";
compatible = "fsl,pq2fads-mdio-bitbang",
"fsl,mpc8280-mdio-bitbang",
"fsl,cpm2-mdio-bitbang";
#address-cells = <1>;
#size-cells = <0>;
reg = <10d40 14>;
fsl,mdio-pin = <9>;
fsl,mdc-pin = <a>;
PHY0: ethernet-...@0 {
interrupt-parent = <&PIC>;
interrupts = <19 2>;
reg = <0>;
device_type = "ethernet-phy";
};
PHY1: ethernet-...@1 {
interrupt-parent = <&PIC>;
interrupts = <19 2>;
reg = <3>;
device_type = "ethernet-phy";
};
};
};
PIC: interrupt-control...@10c00 {
#interrupt-cells = <2>;
interrupt-controller;
reg = <10c00 80>;
compatible = "fsl,mpc8280-pic", "fsl,cpm2-pic";
};
};
chosen {
linux,stdout-path = "/soc/cpm/ser...@11a00";
};
};
Any help would be greatly appreciated.
--
Andres F Marquez
EdgeAccess
Development
amarq...@edgeaccess.net
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