AVR32

$/!\$ This effort is out of date and won't work with the latest version of FreeBSD

$/!\$ AVR discontinued the AVR32 architecture development

AVR32 is a 32 bit RISC architecture from Atmel designed for high throughput with low power consumption. This port targets the bigger AP7 chips.

Boards

Atmel NGW100 http://www.atmel.com/tools/NGW100MKIINETWORKGATEWAYKIT.aspx

Status

NGW100 boots to single user mode

What works

Booting kernel with tftp
Mounting rootfs from onboard flash (cfi) or using nfs
Can execute statically linked commands in single user mode

What does not work

Dynamic linking (binutils bug?)
Lots of other stuff

Source and Binaries

https://web.archive.org/web/20081010065642/http://www.atmel.no/buildroot/buildroot-u-boot.html (archive.org)

Build

export SRCROOT=/src/FreeBSD/p4/avr32/src
export TARGET_ARCH=avr32
export TARGET=avr32
export TARGET_CPUTYPE=avr32
export KERNCONF=NGW100
export MAKEOBJDIRPREFIX=/src/FreeBSD/obj/avr32
export TFTPBOOT=/src/FreeBSD/tftpboot

make WITHOUT_GDB=yes kernel-toolchain

make NO_MODULES=yes buildkernel
KERNOBJDIR=$MAKEOBJDIRPREFIX/$TARGET_ARCH.$TARGET_ARCH/$SRCROOT/sys/$KERNCONF
OBJCOPY=$MAKEOBJDIRPREFIX/$TARGET_ARCH.$TARGET_ARCH/$SRCROOT/tmp/usr/bin/objcopy
$OBJCOPY -O binary $KERNOBJDIR/kernel $KERNOBJDIR/kernel.binary
mkimage -A avr32 -O freebsd -a 0x90000000 -e 0x90000000 -n 'FreeBSD' \
    -T kernel -C none -d $KERNOBJDIR/kernel.binary $TFTPBOOT/kernel.uboot

mkimage is a part of uboot package (devel/u-boot port)

Boot

U-boot 1.3 or later is required to boot. Update instructions and binaries can be found at https://web.archive.org/web/20081010065642/http://www.atmel.no/buildroot/buildroot-u-boot.html (archive.org)

Only tested why of booting is using tftp, dhcpd and nfs. * Setup isc-dhcpd and add the following entry:

host ngw {
        hardware ethernet <board mac address>;
        option root-path "<nfs server>:<avr32 root>";
        next-server <tfpd server>;
        filename "kernel.uboot";
}

Board mac address can be found by typing 'printenv ethaddr' in u-boot
Enable nfsd and add line for <avr32 root> to /etc/exports
Enable tftpd in inetd.conf, modify -s parameter to point to directory with AVR32 kernels

To boot, type: 'dhcp; bootm' in u-boot.

CategoryHistorical