lkml.org 
[lkml]   [2012]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [question] x86/x86_64 boot process
    From
    Would it be reasonable to put the setup code at 0x7c00 (given that I
    can fit my boot loader in the space before the kernel header)?

    On Tue, Jun 12, 2012 at 5:20 PM, Brandon Falk <bfalk@gamozolabs.com> wrote:
    > It's currently only for learning purposes, and I will change loading
    > from 0x90000. Thanks for the help, now that I know that I'm
    > responsible for loading the protected-mode code, I know what to do
    > next.
    >
    > On Tue, Jun 12, 2012 at 5:16 PM, H. Peter Anvin <hpa@zytor.com> wrote:
    >> On 06/12/2012 02:14 PM, Brandon Falk wrote:
    >>> All I really see related to the post-setup stage is:
    >>>
    >>> 'The 32-bit (non-real-mode) kernel starts at offset (setup_sects+1)*512
    >>> in the kernel file (again, if setup_sects == 0 the real value is 4.)
    >>> It should be loaded at address 0x10000 for Image/zImage kernels and
    >>> 0x100000 for bzImage kernels.'
    >>>
    >>> I've read this document a few times, and it doesn't seem to mention if
    >>> the kernel assists in loading. Do I have to load up the whole
    >>> protected-mode kernel? Just the first few sectors? I guess that's what
    >>> I'm trying to figure out, and I feel the boot.txt has not answered
    >>> that for me.
    >>>
    >>
    >> I would also strongly discourage you from writing a new bootloader if
    >> you can avoid it.  You *certainly* want to avoid the use of the fixed
    >> 0x90000 address, that is a decade obsolete.
    >>
    >>        -hpa
    >>
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2012-06-13 00:04    [W:0.048 / U:62.480 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site