Messages in this thread |  | | Date | Thu, 13 Feb 2014 05:59:08 +0000 (GMT) | From | Jongman Heo <> | Subject | [x86 question] invalid conversion of bootloader_type and bootloader_version ?? |
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Hi, all,
While looking at x86 boot code (arch/x86/kernel/setup.c), I got confused due to bootloader_type and bootloader_version conversion.
I've only checked GRUB and U-Boot bootloader code.
1. GRUB 2 type_of_loader setting = 0x72 -> bootloader_type = 0x72, bootloader_version = 0x2
2. U-Boot type_of_loader setting = 0x8 -> bootloader_type = 0x8, bootloader_version = 0x8
3. example in Documentation/x86/boot.txt type_of_loader = 0xE4, ext_loader_type = 0x05, ext_loader_ver = 0x23, for T = 0x15, V = 0x234 -> bootloader_type = 0x154, bootloader_version = 0x234
So, for GRUB 2 and the example bootloader, T != bootloader_type. Is this intended? First I thought that bootloader_type and bootloader_version should match with T and V configured in the bootloader.
This would not bring any real world issue, but I'm just curious.
Regards, Jongman Heo.
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