base: 3.2.0
## + patch-3.2.2.bz2    [probably would work]

## wget http://www.acmesystems.it/foxg20/download/kernel_2.6.38/makefile
wget http://foxg20.acmesystems.it/download/kernel_2.6.38/makefile
# this file takes precedence over the Makefile in that directory.
# The kernel executable is called uImage and the kernel modules are
# placed in the foxg20-modules directory. Both uImage and those
# kernel modules need to be moved to the target FoxG20.
#
# N.B. This patch should be in place _before_ make (with any argument)
# is run as this sets the ARCH=arm and other important environment
# variables. Without this a kernel will be probably be built for an
# i386 architecture.

# Building a .config file from scratch is painful (but instructive
# especially if you have a few days to waste). Acme provides some
# old .config files. One was here:
# wget http://www.acmesystems.it/foxg20/download/kernel_2.6.38/.config
# But Acme re-arranged their web pages again ... now at:
# wget http://foxg20.acmesystems.it/download/kernel_2.6.38/.config
# but that is getting a bit old for lk 3.2.0 and has way too many
# modules selected.
# It is probably better to fetch
wget http://sg.danny.cz/foxg20/320.config
cp 320.config .config
# That .config file should be placed in the top level directory of
# the kernel source tree. The user may like to run
# 'make menuconfig' to check all drivers and modules required are
# chosen. My .config file takes the minalmist approach.

# The following patches and/or downloads should be done in the
# top level kernel source directory.
# Patches can be checked with (for example):
#  'patch -p1 --dry-run < ../gpio_dev32a.patch'
# and if that works drop the "--dry-run" to apply.
#
# My patches (without the leading "../") can be found at
# http://sg.danny.cz/foxg20/ 

# Following adds gpiodev driver with /dev/gpio device. Ioctl
# interface in <kernel_src>/include/linux/gpio_dev.h :
../gpio_dev32a.patch
# Enable "Atmel AT91 I2C Two-Wire interface (TWI)" silicon
# driver. Kernel mainline says Atmel's silicon broken, not
# any more ...
../i2c-at91_2637dpg2.patch
# Configure AT91SAM9G20 silicon for SPI_1. Uses PB0, PB1, and
# PB2 plus PB3 (select for MMC_SPI) and PC5 (select for SPIDEV):
../fg20_spi304.patch
# Want second I2C bus. This time use bit banging kernel driver
# PA25(SDA) and PA26(SCL):
../extra_i2c_313.patch
# Mainline kernel builds for 1 debug serial port (ttyS0) and 6
# additional ports (ttyS1-6). Add conguration option to have
# or remove UART4 (ttyS5) and/or UART5 (ttyS6):
../fg20_4_6_serial313.patch
# If using the the FoxG20 V2 then a new driver is needed for the
# DS28EA00 1-wire chip (temperature sensor and power supply control).
# This driver is written by Claudo Mignanti with some modifications
# by the author. The driver is integrated into the kernel source so
# it can be a built in driver (rather than a module).
../w1_slv_ds28ea00a.patch

# This patch is required to access SDHC cards. A rewrite of the
# drivers/mmc/core/sd.c file in lk 3.0 resulted in accessing of
# SDHC cards (typically all those 4 GBytes and larger) to fail.
# The culprits have been informed but have yet to fix this.
# Reverting that file to the state it was in lk 3.6.38 fixes
# the problem (and in lk 3.2 another minor change is needed).
../mmc_core_sd_hc32.patch

# Assuming a build on a recent Debian based distribution (e.g.
# Ubuntu 11.10 or Mint 12) then an ARM cross build environment
# is needed. That can be loaded with:
# 'apt-get install gcc-arm-linux-gnueabi'
# This will also be need to make the uboot image:
# 'apt-get install u-boot-tools'

# build the kernel with 'make; make modules; make modules_install'.
# Depending on the .config chosen, a few or a lot of selections may
# need to be made.

# Note: Acme's .config selects way too many modules, most of which
# will never be used. This slows down the build and leads to
# some silly selection questions (e.g. "want the latest xyz Fibre
# Channel adapter driver?"). Geert Vancompernolle has provided a
# more compact .config file. Others may need add modules/drivers
# according to their needs. [Only general purpose distributions
# need to select almost everything as a module!]

#
# dpg 20120202