Qemu 闪存启动不起作用 [英] Qemu flash boot up does not work

问题描述

我有一本使用 u-boot 和 qemu 的嵌入式 ARM linux 书籍，相当旧(2009 年出版).书中解释的qemu与u-boot二进制的用法如下:

I have a rather old (published in 2009) embedded ARM linux book that uses u-boot and qemu. The usage of qemu with the u-boot binary explained in the book is as follows:

qemu-system-arm -M connex -pflash u-boot.bin -nographic

它使用的是 qemu 0.9.1，而我的是 2.1.0:

It uses qemu 0.9.1, and mine is 2.1.0:

qemu-system-arm --version
QEMU emulator version 2.1.0, Copyright (c) 2003-2008 Fabrice Bellard

然而，当我执行相同的命令时，我收到了这些错误消息.

When I executed the same command, however, I got these error messages.

qemu-system-arm: failed to read the initial flash content
qemu-system-arm: Initialization of device cfi.pflash01 failed

可能有什么问题?这是来自新的命令参数吗?我有 this site 使用不同的命令，但是当我尝试使用它时，我看到一个空白屏幕.

What might be wrong? Is this from the new command parameter? I have this site that uses different command, but when I tried that I see a blank screen.

qemu-system-arm -M versatilepb -m 128M -nographic -kernel u-boot.bin

我使用 Mac OS X 特立独行的 qemu.

I use Mac OS X maverick for qemu.

推荐答案

我已经试过了:

dd if=/dev/zero of=flash.bin bs=4096 count=4096
arm-linux-gnueabihf-as -o add.o add.S
arm-linux-gnueabihf-ld -Ttext=0x0 -o add.elf add.o
arm-linux-gnueabihf-objcopy -O binary add.elf add.bin
dd if=add.bin of=flash.bin bs=4096 conv=notrunc
qemu-system-arm -M connex -pflash flash.bin -nographic -serial /dev/null -gdb tcp::1234 -S

其中 add.S 是:

where add.S is:

.text
entry: b start
arr:    .byte 1, 2, 3, 4, 5, 6
eoa:
.align
start:  
    ldr r0, =eoa
    ldr r1, =arr
    mov r3, #0
loop:
    ldrb r2, [r1], #1
    add r3, r2, r3
    cmp r1, r0
    bne loop
stop:   b stop

看起来程序运行良好......

And it seems that program works fine ...

qemu-system-arm --version
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.5), Copyright (c) 2003-2008 Fabrice Bellard

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