NetBSD: Difference between revisions

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(note utilities in pkgsrc-wip)
(s/LegacyBIOS/SeaBIOS/g and some slight rewording and additional details)
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</source>
</source>


== building [[LegacyBIOS]] on NetBSD ==
== building [[SeaBIOS]] on NetBSD ==
A change is required to '''legacybios/Makefile''', then gmake can be used to build LegacyBIOS in the normal way.
A change is required to '''seabios/Makefile''', then gmake can be used to build SeaBIOS in the normal way.
<source lang="text">
<source lang="text">
-$(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
-$(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c
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Legacy interrupt routing (the PCI interrupt line register) is traditionally not
Legacy interrupt routing (the PCI interrupt line register) is traditionally not
implemented on many mainboards under coreboot. MPBIOS or ACPI will be required.
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
NetBSD does not (without patching) search for a MPBIOS floating pointer at the location
coreboot usually places it.  LegacyBIOS does relocate this pointer structure however.
coreboot usually places it.  SeaBIOS does relocate this pointer structure however.


=== BIOS calls ===
=== BIOS calls ===
(This section is probably only relevant when not loading via SeaBIOS.)
NetBSD/i386 GENERIC still makes some BIOS calls after boot(8):
NetBSD/i386 GENERIC still makes some BIOS calls after boot(8):
* isapnp(4)
* isapnp(4)

Revision as of 18:39, 4 July 2008

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.

<source lang="text"> Index: src/config/Config.lb

=======================================================

--- src/config/Config.lb (revision 3389) +++ src/config/Config.lb (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

</source>


coreboot v3

<source lang="text"> 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

</source>

On NetBSD libintl is required to build kconfig. <source lang="bash"> gmake INTLLIBS=-lintl menuconfig </source>

building SeaBIOS on NetBSD

A change is required to seabios/Makefile, then gmake can be used to build SeaBIOS in the normal way. <source lang="text"> -$(Q)/bin/echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c +$(Q)echo -e '$(foreach i,$2,#include "../$i"\n)' > $3.tmp.c </source>

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.

Public domain I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.