base: 3.1
+ patch-3.1.5.bz2

## 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.

## wget http://www.acmesystems.it/foxg20/download/kernel_2.6.38/.config
# Acme re-arranged there web pages again ... now at:
wget http://foxg20.acmesystems.it/download/kernel_2.6.38/.config
# or ../2639.config (../313.config or whatever) copied to .config

>> reverted drivers/mmc/core/sd.c found in lk 3.0.0++ to the
>> version found in lk 2.6.38.6 and that enabled a SDHC card
>> to be read.

# 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_dev31a.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_dev31a.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

# 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 20111204