Re: GRUB2 problem with Linux EDD module?

[Andrey Borzenkov]

В Thu, 7 Feb 2013 11:21:42 +0800
Wang Weber <address@hidden> пишет:

> Hi,
> 
> Recently I tried to create a Fedora 14 bootable USB key for X86_64. In the
> Kickstart script I want to use Linux EDD (Bios Enhanced Disk Drive
> Services)  module to get the biosdisk information, however I met some
> strange behaviors. Following is the two tests:
> 
> 1. Install GRUB2 ((GRUB) 2.00) to the USB key and boot up the system, the
> EDD module cannot be correctly loaded with following kernel error message:
> 
>                 edd information not available
> 
> 2. Install GRUB 0.97 to the USB key and boot up the system, the EDD module
> could be loaded successfully. All the kernel option is the same with the
> previous case.
> 
> 
> 
> Looking into the code, Linux uses BIOS INT41 and INT48 calls to collect
> disk information during boot up stage, it seems that when GRUB2 is used,
> these calls cannot give correct information...
> 

Interesting. I was wondering why edd does not work here ... I have to
try with legacy grub.

Where exactly it (edd module) fails? 

> However, I also tried to add debug information to GRUB2, the INT41 worked
> correctly for GRUB2.
> 
> Anyone could help me to explain the reason? Thanks a lot.
> 
> -Weber