Hello, I've tried to compile 2.6.10-rc2-mm4 without ACPI on an i386-arch. It shows: arch/i386/kernel/built-in.o(.init.text+0x167e): In function `setup_arch': : undefined reference to `acpi_boot_table_init' make: *** [.tmp_vmlinux1] Fehler 1 The patch which seems to be responsible is: x86_64-split-acpi-boot-table-parsing.patch Around line 83 and the following. acpi_boot_table_init is located in arch/i386/kernel/acpi/boot.c But it's only compiled with CONFIG_ACPI_BOOT set. The attached patch fixes the problem by adding a dummy function to include/linux/acpi.h - like it's done for acpi_init() too. Regards, Carsten Please cc, I'm not subscribed.