最近又开始重新拿起以前做东西——试着将Linux内核移植在Virtex-II Pro的开发板上，不过用了很新的内核2.6.29和2.6.33的版本。

基本的平台信息

# Target Board:  Xilinx XUP Virtex-II Pro Development System Rev C

# Family:    virtex2p

# Device:    xc2vp30

# Package:   ff896

# Speed Grade:  -7

# Processor: ppc405_0

# Processor clock frequency: 200.00 MHz

# Bus clock frequency: 100.00 MHz

# On Chip Memory :  32 KB

# Total Off Chip Memory : 256 MB

# – DDR_SDRAM = 256 MB

图1. Base System的组成

内核版本linux-2.6-xlnx2.6.29

device Tree(dts file)

/* Device Tree Generator version: 1.3

*

* (C) Copyright 2007-2008 Xilinx, Inc.

* (C) Copyright 2007-2009 Michal Simek

*

* Michal SIMEK

*

* 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.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place, Suite 330, Boston,

* MA 02111-1307 USA

*

* CAUTION: This file is automatically generated by libgen.

* Version: Xilinx EDK 10.1.03 EDK_K_SP3.6

*

* XPS project directory: Linux_port_UART16550

*/

/dts-v1/;

{

#address-cells = <1>;

#size-cells = <1>;

compatible = "xlnx,virtex405", "xlnx,virtex";

model = "testing";

DDR_SDRAM: memory@0 {

device_type = "memory";

reg = < 0x0 0x10000000 >;

} ;

aliases {

ethernet0 = &Ethernet_MAC;

serial0 = &RS232_Uart_1;

} ;

chosen {

bootargs = "console=ttyS0 root=/dev/ram";

linux,stdout-path = "/plb@0/serial@83e00000";

} ;

cpus {

#address-cells = <1>;

#cpus = <0x1>;

#size-cells = <0>;

ppc405_0: cpu@0 {

clock-frequency = <200000000>;

compatible = "PowerPC,405", "ibm,ppc405";

d-cache-line-size = <0x20>;

d-cache-size = <0x4000>;

dcr-access-method = "native";

dcr-controller ;

device_type = "cpu";

i-cache-line-size = <0x20>;

i-cache-size = <0x4000>;

model = "PowerPC,405";

reg = <0>;

timebase-frequency = <200000000>;

xlnx,dcr-resync = <0x0>;

xlnx,deterministic-mult = <0x0>;

xlnx,disable-operand-forwarding = <0x1>;

xlnx,fastest-plb-clock = "DPLB0";

xlnx,generate-plb-timespecs = <0x1>;

xlnx,mmu-enable = <0x1>;

} ;

} ;

plb0: plb@0 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "xlnx,plb-v46-1.03.a", "xlnx,plb-v46-1.00.a", "simple-bus";

ranges ;

DDR_SDRAM: mpmc@84800000 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "xlnx,mpmc-4.03.a";

reg = < 0x84800000 0x10000 >;

} ;

DIPSWs_4Bit: gpio@81420000 {

compatible = "xlnx,xps-gpio-1.00.a";

reg = < 0x81420000 0x10000 >;

xlnx,all-inputs = <0x1>;

xlnx,all-inputs-2 = <0x0>;

xlnx,dout-default = <0x0>;

xlnx,dout-default-2 = <0x0>;

xlnx,family = "virtex2p";

xlnx,gpio-width = <0x4>;

xlnx,interrupt-present = <0x0>;

xlnx,is-bidir = <0x1>;

xlnx,is-bidir-2 = <0x1>;

xlnx,is-dual = <0x0>;

xlnx,tri-default = <0xffffffff>;

xlnx,tri-default-2 = <0xffffffff>;

} ;

Ethernet_MAC: ethernet@81000000 {

compatible = "xlnx,xps-ethernetlite-2.00.b", "xlnx,xps-ethernetlite-1.00.a";

device_type = "network";

interrupt-parent = ;

interrupts = < 1 0 >;

local-mac-address = [ 00 0a 35 8e 08 00 ];

reg = < 0x81000000 0x10000 >;

xlnx,duplex = <0x1>;

xlnx,family = "virtex2p";

xlnx,rx-ping-pong = <0x1>;

xlnx,tx-ping-pong = <0x1>;

} ;

LEDs_4Bit: gpio@81400000 {

compatible = "xlnx,xps-gpio-1.00.a";

reg = < 0x81400000 0x10000 >;

xlnx,all-inputs = <0x0>;

xlnx,all-inputs-2 = <0x0>;

xlnx,dout-default = <0x0>;

xlnx,dout-default-2 = <0x0>;

xlnx,family = "virtex2p";

xlnx,gpio-width = <0x4>;

xlnx,interrupt-present = <0x0>;

xlnx,is-bidir = <0x0>;

xlnx,is-bidir-2 = <0x1>;

xlnx,is-dual = <0x0>;

xlnx,tri-default = <0xffffffff>;

xlnx,tri-default-2 = <0xffffffff>;

} ;

PushButtons_5Bit: gpio@81440000 {

compatible = "xlnx,xps-gpio-1.00.a";

reg = < 0x81440000 0x10000 >;

xlnx,all-inputs = <0x1>;

xlnx,all-inputs-2 = <0x0>;

xlnx,dout-default = <0x0>;

xlnx,dout-default-2 = <0x0>;

xlnx,family = "virtex2p";

xlnx,gpio-width = <0x5>;

xlnx,interrupt-present = <0x0>;

xlnx,is-bidir = <0x1>;

xlnx,is-bidir-2 = <0x1>;

xlnx,is-dual = <0x0>;

xlnx,tri-default = <0xffffffff>;

xlnx,tri-default-2 = <0xffffffff>;

} ;

RS232_Uart_1: serial@83e00000 {

clock-frequency = <100000000>;

compatible = "xlnx,xps-uart16550-2.00.b", "xlnx,xps-uart16550-2.00.a", "ns16550";

current-speed = <9600>;

device_type = "serial";

interrupt-parent = ;

interrupts = < 2 2 >;

reg = < 0x83e00000 0x10000 >;

reg-offset = <0x1003>;

reg-shift = <2>;

xlnx,family = "virtex2p";

xlnx,has-external-rclk = <0x0>;

xlnx,has-external-xin = <0x0>;

xlnx,is-a-16550 = <0x1>;

} ;

SysACE_CompactFlash: sysace@83600000 {

compatible = "xlnx,xps-sysace-1.00.a";

interrupt-parent = ;

interrupts = < 0 2 >;

reg = < 0x83600000 0x10000 >;

xlnx,family = "virtex2p";

xlnx,mem-width = <0x10>;

} ;

xps_bram_if_cntlr_1: xps-bram-if-cntlr@ffff8000 {

compatible = "xlnx,xps-bram-if-cntlr-1.00.a";

reg = < 0xffff8000 0x8000 >;

xlnx,family = "virtex2p";

} ;

xps_intc_0: interrupt-controller@81800000 {

#interrupt-cells = <0x2>;

compatible = "xlnx,xps-intc-1.00.a";

interrupt-controller ;

reg = < 0x81800000 0x10000 >;

xlnx,kind-of-intr = <0x2>;

xlnx,num-intr-inputs = <0x3>;

} ;

} ;

ppc405_0_dplb1: plb@1 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "xlnx,plb-v46-1.03.a", "xlnx,plb-v46-1.00.a", "simple-bus";

ranges ;

} ;

;

硬件系统的的配置和Linux内核的配置基本是是按照参考4做的。

Linux内核启动

通过编译好的内核文件simpleImage.initrd.virtex405-yao.elf文件通过XMD工具下载到板子上进行测试.

XMD%dow simpleImage.initrd.virtex-yao.elf

在串口终端显示如下内容：

zImage starting: loaded at 0x00400000 (sp: 0x00857fb0)

Allocating 0x345810 bytes for kernel ...

gunzipping (0x00000000

Attached initrd image at 0x00591000-0x008560b7

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0 ip=on root=/dev/ram

Finalizing device tree... flat tree at 0x864300

后来通过修改arch/powerpc/boot/main.c来打印出一些调试信息，确定程序停止在第210行，运行kentry函数，见图2。

图2. arch/powerpc/boot/main.c 部分代码

Ref

1. Linux Operating System Software Debugging Techniques with Xilinx Embedded Development Platforms

2. Debugging Kernel Boot Problems  from Xilinx Open Source Wiki

3."Finalizing device tree… flat tree at 0x5a4300" —- Linux booting problem on custom board. (virtex4fx140)

from Xilinx Forums

4. Tutorials for Running Linux on Xilinx FPGAs

5.Linux kernel git from Xilinx and device trees