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This page documents coreboot usage with NetBSD. It is probably terser than it could be, as it mostly just describes differences from the more-commonly-documented Linux procedures.

building coreboot on NetBSD

GNU make is required to build coreboot, install it from pkgsrc/devel/gmake.

coreboot v2

As of revision 3363 only one change needs to be made.

Index: src/config/
--- src/config/        (revision 3389)
+++ src/config/        (working copy)
@@ -5,7 +5,7 @@
 makedefine CPP:= $(CC) -x assembler-with-cpp -DASSEMBLY -E
 makedefine LIBGCC_FILE_NAME := $(shell $(CC) -print-libgcc-file-name)
-makedefine GCC_INC_DIR := $(shell LC_ALL=C $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp")
+makedefine GCC_INC_DIR := /usr/include
 makedefine CPPFLAGS := -I$(TOP)/src/include -I$(TOP)/src/arch/$(ARCH)/include -I$(GCC_INC_DIR) $(CPUFLAGS)
 makedefine CFLAGS := $(CPU_OPT) $(DISTRO_CFLAGS) $(CPPFLAGS) -Os -nostdinc -nostdlib -fno-builtin  -Wall

coreboot v3

Index: Makefile
--- Makefile    (revision 690)
+++ Makefile    (working copy)
@@ -106,7 +106,7 @@
 # Note: This _must_ come after 'CC' is set for the second time in this
 # Makefile (see above), otherwise the build would break if 'gcc' isn't
 # the compiler actually used for the build (e.g. on cross compiler setups).
-CFLAGS += -nostdinc -isystem `$(CC) -print-file-name=include`
+CFLAGS += -nostdinc -isystem /usr/include
 include lib/Makefile
 include device/Makefile

On NetBSD libintl is required to build kconfig.

gmake INTLLIBS=-lintl menuconfig

building SeaBIOS on NetBSD

A change is required to seabios/Makefile, then gmake can be used to build SeaBIOS in the normal way.

-$(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
+$(Q)echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c

using NetBSD/x86 with coreboot

interrupt routing

Legacy interrupt routing (the PCI interrupt line register) is traditionally not implemented by coreboot on many mainboards. MPBIOS or ACPI will be required otherwise.

NetBSD does not (without patching) search for a MPBIOS floating pointer at the location coreboot usually places it. SeaBIOS does relocate this pointer structure however.

BIOS calls

(This section is probably only relevant when not loading via SeaBIOS.)

NetBSD/i386 GENERIC still makes some BIOS calls after boot(8):

  • isapnp(4)
  • mca(4)

Removal of these subsystems from your kernel config(5) file removes these calls.

Due to the nature of x86_64, BIOS calls on NetBSD/amd64 are not a problem, as they cannot be made from long-mode.

coreboot-related utilities

Both nvramtool and flashrom are in pkgsrc-wip.

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