grub2

[Chopper]

Hi all,

I have a few questions about diskboot.S.

Here is the last few lines of this file:

/* fill the first data listing with the default */

blocklist_default_start:

/* this is the sector start parameter, in logical sectors from

  the start of the disk, sector 0 */

.long 2, 0

blocklist_default_len:

/* this is the number of sectors to read.  grub-mkimage

  will fill this up */

.word 0

blocklist_default_seg:

/* this is the segment of the starting address to load the data into */

.word (GRUB_BOOT_MACHINE_KERNEL_SEG + 0x20)

firstlist: /* this label has to be after the list data!!! */

Question:

1.I want to know how the value of blocklist_default_len  is filled.

2.Is blocklist_default_len equal to the size of kernel.img?   

3.Is it passible to get the size of kernel.img and use it as one of some parameters to hash kernel.img in diskboot.S?