--- a-2.6.7/arch/i386/kernel/acpi/boot.c.orig	2004-09-13 17:54:56.105145968 +0800
+++ a-2.6.7/arch/i386/kernel/acpi/boot.c	2004-09-13 17:56:41.680096136 +0800
@@ -478,6 +478,7 @@ acpi_scan_rsdp (
 {
 	unsigned long		offset = 0;
 	unsigned long		sig_len = sizeof("RSD PTR ") - 1;
+	unsigned long 		rsdp;
 
 	/*
 	 * Scan all 16-byte boundaries of the physical memory region for the
@@ -486,6 +487,11 @@ acpi_scan_rsdp (
 	for (offset = 0; offset < length; offset += 16) {
 		if (strncmp((char *) (start + offset), "RSD PTR ", sig_len))
 			continue;
+		rsdp = *((unsigned long*)(start + offset + 16));
+		if (rsdp == 0 || rsdp > (1UL<<16)) {
+			printk("WRONG RSDP!! Try to find one usable...\n");
+			continue;
+		}	
 		return (start + offset);
 	}