Hi guys:
For linux-2.4.31,How /dev/initrd is associated with the initrd image?
I have read some codes but some questions:
Kernel command line: root=/dev/ram0 initrd=0x01400000,1600k keepinitrd
Initrd Image is at 0x01400000,
And in the init/do_mounts.c
static int __init initrd_load(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, 0), NULL);
create_dev("/dev/initrd", MKDEV(RAMDISK_MAJOR, INITRD_MINOR),
NULL);
#endif
return rd_load_image("/dev/initrd");
}
It create a device "/dev/initrd"...
In the following function:static int __init rd_load_image(char *from)
...
in_fd = open(from, O_RDONLY, 0); (it open the dev/initrd)
...
nblocks = identify_ramdisk_image(in_fd, rd_image_start);
In the identify_ramdisk_image
{
lseek(fd, start_block * BLOCK_SIZE, 0); (it read the buf from the
/dev/initrd,actuall it is the image located at 0x01400000,right?)
read(fd, buf, size);
}
So,how does it know /dev/initrd is related to the initrd image?
Thanks!
rui
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