36 lines
1012 B
Diff
36 lines
1012 B
Diff
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--- linux-3.5.4/arch/x86/kernel/acpi/boot.c 2012-11-05 06:02:54.660816905 +0000
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+++ linux-3.5.4.rasm/arch/x86/kernel/acpi/boot.c 2012-11-05 06:02:16.044145822 +0000
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@@ -1586,8 +1586,31 @@
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if (!arg)
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return -EINVAL;
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+ /*
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+ This hack uses RTC Alarm Hour register to signal if we
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+ should enable ACPI or not. This is used to overcome a bug in
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+ Kontron pITX-SP and IO-APIC, where we need to boot the
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+ kernel without ACPI, reboot and then enable ACPI.
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+ */
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+ if (strcmp(arg, "hack") == 0)
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+ {
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+ outb(0x05 | 0x80, 0x70);
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+ if (inb(0x71) == 1)
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+ {
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+ outb(0x05 | 0x80, 0x70);
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+ outb(0x00, 0x71);
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+ printk(KERN_WARNING "ACPI: overriding acpi=off\n");
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+ }
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+ else
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+ {
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+ outb(0x05 | 0x80, 0x70);
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+ outb(0x01, 0x71);
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+ printk(KERN_WARNING "ACPI: reboot needed\n");
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+ disable_acpi();
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+ }
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+ }
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/* "acpi=off" disables both ACPI table parsing and interpreter */
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- if (strcmp(arg, "off") == 0) {
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+ else if (strcmp(arg, "off") == 0) {
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disable_acpi();
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}
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/* acpi=force to over-ride black-list */
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