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    SubjectRe: reboot problem
    Date
    In article <Pine.LNX.3.95.960917115231.4082A-100000@dwarf.polaris.net>,
    Dale Scheetz <dwarf@polaris.net> wrote:
    >My suspision, and it's nothing more than that, is that something in the
    >kernel is inadvertantly clobbering the boot vector in memory (I
    >forget...it's either at 0000 or FFFE?) so that reboot jumps into the swamp
    >when it tries.

    I think the boot vector is in ROM (000FFFF0), so there should be no
    problem with the kernel clobbering it. Also, I have had this problem
    and managed to make it go away by doing a cold software reset. The
    BIOS must be getting control, since it must be checking the cold reset
    'flag'. I guess something (sounds like the kernel) is hitting part of
    the BIOS data area, and some types of BIOS don't cope. A patch along
    these lines may help.

    *** linux/arch/i386/kernel/process.c Fri Apr 19 16:35:15 1996
    --- linux/arch/i386/kernel/process.c.cold Fri Sep 20 20:14:06 1996
    ***************
    *** 199,205 ****
    sti();
    /* rebooting needs to touch the page at absolute addr 0 */
    pg0[0] = 7;
    ! *((unsigned short *)0x472) = 0x1234;
    for (;;) {
    for (i=0; i<100; i++) {
    kb_wait();
    --- 199,205 ----
    sti();
    /* rebooting needs to touch the page at absolute addr 0 */
    pg0[0] = 7;
    ! *((unsigned short *)0x472) = 0;
    for (;;) {
    for (i=0; i<100; i++) {
    kb_wait();

    Neil Turton.
    Churchill College, Cambridge. CB3 0DS. England.

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