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Re: Out of Range Pointer Error
Posted: Mon Jan 05, 2015 7:45 pm
by eryjus
Can you share your source for the .multiboot section? I assume you were trying to use GRUB2 with a GRUB Legacy header/signature?
Re: Out of Range Pointer Error
Posted: Mon Jan 05, 2015 7:55 pm
by jvc
Yes, I am using a multiboot 1 header.
Here is the header:
Code: Select all
[BITS 32]
MBALIGN equ 1<<0
MEMINFO equ 1<<1
GRAPHICSINFO equ 1<<2
FLAGS equ MBALIGN | MEMINFO | GRAPHICSINFO
MAGIC equ 0x1BADB002
CHECKSUM equ -(MAGIC + FLAGS)
KERNEL_VIRTUAL_BASE equ 0xC0000000
KERNEL_PAGE_NUMBER equ (KERNEL_VIRTUAL_BASE >> 22)
[section .multiboot]
MultiBootHeader:
align 4
dd MAGIC
dd FLAGS
dd CHECKSUM
dd 0
dd 0
dd 0
dd 0
dd 0
dd 1
dd 0
dd 0
dd 0
Re: Out of Range Pointer Error
Posted: Mon Jan 05, 2015 8:29 pm
by eryjus
Thank you.
The only thing I can think of is that GRUB2 likes the MB2 header to be 8-byte aligned. I know you are using MB Legacy header, but you might try aligning it to 8 bytes to see.
Also, it shouldn't matter, but I have my video information specified in the header (not left as 0) and I can boot an MB1 header with GRUB2.
Re: Out of Range Pointer Error
Posted: Mon Jan 05, 2015 8:50 pm
by jvc
Tried changing both of those things but no difference, grub2 fails while grub legacy has no issues.
The upside is that this bug disappears as soon as I make any real change. I have managed, while booting with grub2, to do a fair amount of development since this bug first appeared without any issues. I'm hoping it doesn't reappear though.