fs: fat: extend for in-PBL support ...

The AT91 BootROM loads a boot.bin file from the first FAT partition
into SRAM, when booting from MMC. To avoid the need for two barebox
configurations for each of the bootloader stages, add PBL support
for reading from FAT. This way each stage need only have a different
PBL entry point.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs: add fat filesystem support ...

This code is based on:

http://elm-chan.org/fsw/ff/00index_e.html

FatFs Generic FAT File System Module

This patch offers a read/write implementation for barebox. The code
does not exaclty match barebox coding style, but works nicely and
should be ready to give it a try.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

remove uncompilable filesystems

Move "ar" flags to config.mk to allow for silent "make -s" ...

Based on patch by Mike Frysinger, 20 Jun 2006

Add support for a saving build objects in a separate directory. ...

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

* Fix CONFIG_NET_MULTI support in include/net.h ...

* Patches by Kyle Harris, 13 Mar 2003:
  - Add FAT partition support
  - Add command support for FAT
  - Add command support for MMC
  ----
  - Add Intel PXA support for video
  - Add Intel PXA support for MMC
  ----
  - Enable MMC and FAT for lubbock board
  - Other misc changes for lubbock board