[lkml]   [2001]   [May]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    Patch in this message
    SubjectbzImage loading directly from floppy
    Hi! broken. If imagesize is 0xf123, bootsect_second only returns
    0xf000 in ax, which is < 0xf123, so it continues loading. Then,
    bootsect_second returns 0x10000, but it is 16 bit register, so it is
    0x0000, and that's also < 0xf123. So it is looping forever.

    It can be fixed like this: (Another possible workaround is to set max
    size in tools/misc.c to 0xefff instead of 0xffff. OTOH it would be
    nice to be able to boot images up to 2.88MB directly from floppy).
    (Okay to commit into x86-64 tree?)

    --- linux/arch/i386/boot/setup.S Tue May 8 12:11:01 2001
    +++ linux/arch/x86_64/boot/setup.S Fri May 25 22:18:57 2001
    @@ -771,6 +774,8 @@
    incb %cs:bootsect_dst_base+2 # to 0x10000
    movb %cs:bootsect_dst_base+2, %ah
    + cmpb $0x20, %ah
    + je realbig
    shlb $4, %ah # we now have the number of
    # moved frames in %ax
    xorb %al, %al
    @@ -779,6 +784,13 @@
    popw %cx

    + movw $0xffff,%ax
    + popw %bx
    + popw %si
    + popw %cx
    + lret
    .word 0, 0, 0, 0
    .word 0, 0, 0, 0
    I'm "In my country we have almost anarchy and I don't care."
    Panos Katsaloulis describing me w.r.t. patents at
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 12:54    [W:2.377 / U:0.344 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site