Embedded Handbook/Boards/LANTank

General topics
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Creating a cross-compiler
Cross-compiling with Portage
Cross-compiling the kernel
Compiling with qemu user chroot
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External resources

Little-endian SuperH based NAS (using internal IDE) from I-O Data.

IO-Data LANTANK specifications

Board specifications:

CODE

# SH4 SH7751 processor, ~266MHz
# 64MB RAM
# Artop Electronic Corp ATP865 IDE controller
# 10/100Mbit Realtek 8139C+ Ethernet controller
# 2x NEC USB 2.0

/proc/cpuinfo

CPU info:

FILE /proc/cpuinfo

machine         : LANDISK
processor       : 0
cpu family      : sh4
cpu type        : SH7751R
cpu flags       : fpu ptea
cache type      : split (harvard)
icache size     : 16KiB (2-way)
dcache size     : 32KiB (2-way)
bogomips        : 266.24
master_clk      : 266.66MHz
module_clk      : 33.33MHz
bus_clk         : 133.33MHz
cpu_clk         : 266.66MHz
tmu0_clk        : 8.33MHz

Cross compile preparation

Setup:

root #emerge --ask crossdev

root #crossdev sh4-unknown-linux-gnu

Emerge wrapper script:

FILE lantank-merge

#!/bin/sh

CHOST=sh4-unknown-linux-gnu

#export CBUILD=$(portageq envvar CBUILD)
export SYSROOT="/usr/${CHOST}"
export PORTAGE_CONFIGROOT="/usr/${CHOST}"

# optional exports
export enable_malloc0returnsnull=yes \
        ac_cv_file__usr_share_sgml_X11_defs_ent=1 \
        ac_cv_func_setpgrp_void=yes ac_cv_func_setgrent_void=yes \
        ac_cv_func_calloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes \
        gl_cv_func_malloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes \
        ac_cv_func_memcmp_working=yes ac_cv_func_strnlen_working=yes

# optional export for glib:2
export glib_cv_uscore=no glib_cv_stack_grows=no \
        glib_cv_stack_grows=no  glib_cv_has__inline=yes \
        glib_cv_has__inline__=yes glib_cv_hasinline=yes \
        glib_cv_sane_realloc=yes glib_cv_va_copy=yes \
        glib_cv___va_copy=yes glib_cv_va_val_copy=no \
        glib_cv_rtldglobal_broken=no glib_cv_uscore=no \
        ac_cv_func_posix_getpwuid_r=yes \
        ac_cv_func_posix_getgrgid_r=yes \
        ac_cv_header_pwd_h=yes \
        ac_cv_func_getpwuid_r=yes \
        glib_cv_sizeof_gmutex=40 

FAKEROOT=
if [[ $(id -u) != 0 ]]; then
	if [[ $(type -p fakeroot) != "" ]]; then
		FAKEROOT=fakeroot
	fi
fi

${FAKEROOT} emerge -q "$@"

FILE /usr/sh4-unknown-linux-gnu/etc/make.conf

CHOST=sh4-unknown-linux-gnu
CBUILD=x86_64-pc-linux-gnu
ARCH="sh"
ROOT=/usr/${CHOST}/
ACCEPT_KEYWORDS="sh ~sh"
USE="${ARCH} zlib bindist make-symlinks minimal \
        input_devices_keyboard input_devices_evdev \
        video_cards_fbdev video_cards_dummy"

VIDEO_CARDS="fbdev dummy"

INPUT_DEVICES="evdev keyboard mouse touchscreen"
USE_EXPAND="video_cards input_devices"
MARCH_TUNE="-m4"
CFLAGS="-Os -pipe ${MARCH_TUNE} -fomit-frame-pointer -I${ROOT}/usr/include/ -I${ROOT}/include/"

CXXFLAGS="${CFLAGS}"
LDFLAGS="-L${ROOT}/usr/lib -L${ROOT}/lib"

PKG_CONFIG_PATH="${ROOT}/usr/lib/pkgconfig/"
MAKEOPTS="-j8"
FEATURES="-collision-protect sandbox buildpkg noman noinfo nodoc"

PORTDIR_OVERLAY="/usr/portage/local/"
PKGDIR=${ROOT}/packages/
PORTAGE_TMPDIR=${ROOT}/tmp/
PORTAGE_WORKDIR_MODE=2775
PORTAGE_ECLASS_WARNING_ENABLE=0

CLEAN_DELAY=0
EPAUSE_IGNORE=1
EBEEP_IGNORE=1

External resources

Mike Frysinger's page about the LANTANK

This page is based on a document formerly found on our main website gentoo.org.
The following people contributed to the original document: Mike Frysinger, Ned Ludd, Robin H. Johnson, Alex Tarkovsky, Alexey Shvetsov, Raúl Porcel, Joshua Saddler on April 28, 2013.
They are listed here because wiki history does not allow for any external attribution. If you edit the wiki article, please do not add yourself here; your contributions are recorded on each article's associated history page.