diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index 3cece19b7473..8b178eded5bc 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -117,7 +117,7 @@ $(obj)/compressed/vmlinux: FORCE
# bzdisk/fdimage/hdimage/isoimage kernel
FDARGS =
# Set this if you want one or more initrds included in the image
-FDINITRD =
+FDINITRD = /boot/initrd.img-6.0.0-rc4yw+
imgdeps = $(obj)/bzImage $(obj)/mtools.conf $(src)/genimage.sh
就是一定要指定根文件才能制作。等有空了我问问内核社区这是几个意思。
bochs配置文件
有了镜像，bochs也装好了，接下来我们就可以启动了。
可以参考下面的配置，
###############################################################
# Configuration file for Bochs
###############################################################
# how much memory the emulated machine will have
megs: 128
# filename of ROM images
romimage: file=/usr/share/bochs/BIOS-bochs-latest
vgaromimage: file=/usr/share/vgabios/vgabios.bin
# what disk images will be used
ata0-slave: type=cdrom, path="image.iso", status=inserted
# choose the boot disk.
boot: cdrom
# where do we send log messages?
# log: bochsout.txt
# disable the mouse
mouse: enabled=0
# enable key mapping, using US layout as default.
#keyboard_mapping: enabled=1, map=/usr/share/bochs/keymaps/x11-pc-us.map
我是把image.iso放在配置文件同一个目录的，大家可以根据自己习惯调整。
然后，启动，运行！
bochs -f bochsrc
内核加载到了哪里？
一切的都很顺利？但是说好的调试呢？断点在哪里设置？什么时候进入的保护模式？
好像我们什么都不知道。我们想要的是内核究竟被加载到哪里了。这样我们才能设置断点，然后调试查看。
For a modern bzImage kernel with boot protocol version >= 2.02, a
memory layout like the following is suggested::
~ ~
| Protected-mode kernel |
100000 +------------------------+
| I/O memory hole |
0A0000 +------------------------+
| Reserved for BIOS | Leave as much as possible unused
~ ~
| Command line | (Can also be below the X+10000 mark)
X+10000 +------------------------+
| Stack/heap | For use by the kernel real-mode code.
X+08000 +------------------------+
| Kernel setup | The kernel real-mode code.
| Kernel boot sector | The kernel legacy boot sector.
X +------------------------+
| Boot loader | <- Boot sector entry point 0000:7C00
001000 +------------------------+
| Reserved for MBR/BIOS |
000800 +------------------------+
| Typically used by MBR |
000600 +------------------------+
| BIOS use only |
000000 +------------------------+
# offset 512, entry point
.globl _start
_start:
# Explicitly enter this as bytes, or the assembler
# tries to generate a 3-byte jump here, which causes
# everything else to push off to the wrong offset.
.byte 0xeb # short (2-byte) jump
.byte start_of_setup-1f
1:
...
.section ".entrytext", "ax"
start_of_setup:
# Force %es = %ds
movw %ds, %ax
movw %ax, %es
cld
# Apparently some ancient versions of LILO invoked the kernel with %ss != %ds,
# which happened to work by accident for the old code. Recalculate the stack
# pointer if %ss is invalid. Otherwise leave it alone, LOADLIN sets up the
# stack behind its own code, so we can't blindly put it directly past the heap.
movw %ss, %dx
cmpw %ax, %dx # %ds == %ss?
movw %sp, %dx
je 2f # -> assume %sp is reasonably set
# Invalid %ss, make up a new stack
movw $_end, %dx
testb $CAN_USE_HEAP, loadflags
jz 1f
movw heap_end_ptr, %dx
1: addw $STACK_SIZE, %dx
jnc 2f
xorw %dx, %dx # Prevent wraparound
2: # Now %dx should point to the end of our stack space
andw $~3, %dx # dword align (might as well...)
jnz 3f
movw $0xfffc, %dx # Make sure we're not zero
3: movw %ax, %ss
movzwl %dx, %esp # Clear upper half of %esp
sti # Now we should have a working stack
.code32
SYM_FUNC_START(startup_32)
/*
* 32bit entry is 0 and it is ABI so immutable!
* If we come here directly from a bootloader,
* kernel(text+data+bss+brk) ramdisk, zero_page, command line
* all need to be under the 4G limit.
*/
cld
cli
leal (BP_scratch+4)(%esi), %esp
call 1f
1: popl %ebp
subl $ rva(1b), %ebp
/* Load new GDT with the 64bit segments using 32bit descriptor */
leal rva(gdt)(%ebp), %eax
movl %eax, 2(%eax)
lgdt (%eax)
/* Load segment registers with our descriptors */
movl $__BOOT_DS, %eax
movl %eax, %ds
movl %eax, %es
movl %eax, %fs
movl %eax, %gs
movl %eax, %ss
/* Setup a stack and load CS from current GDT */
leal rva(boot_stack_end)(%ebp), %esp
pushl $__KERNEL32_CS
leal rva(1f)(%ebp), %eax
pushl %eax
lretl