IBM messed up *AGAIN* in their thinkpad: 0xA0000 -> 0x9F000

/*
     * IBM messed up *AGAIN* in their thinkpad: 0xA0000 -> 0x9F000.
     * They seem to have done something stupid with the floppy
     * controller as well..
     */
    while (start_low_mem < 0x9f000) {
        clear_bit(PG_reserved, &mem_map[MAP_NR(start_low_mem)].flags);
        start_low_mem += PAGE_SIZE;
    }
1.3.100

原文：http://www.cnblogs.com/mull/p/7997670.html