* Patch by Stephen Williams, 01 Apr 2004:

[people/ms/u-boot.git] / CHANGELOG

======================================================================
Changes for U-Boot 1.1.1:
======================================================================

* Patch by Stephen Williams, 01 Apr 2004:
  Add support for Picture Elements JSE board

* Patch by Christian Pell, 01 Apr 2004:
  Add CompactFlash support for PXA systems.

* Patches by Pantelis Antoniou, 30 Mar 2004:
  - add auto-complete support to the U-Boot CLI
  - add support for NETTA and NETPHONE boards; fix NETVIA board
  - add support for the Epson 156x series of graphical displays
    (These displays are serial and not suitable for using a normal
    framebuffer console on them)
  - add infrastructure needed in order to POST any DSPs in a board
  - improve and fix various things in the MPC8xx FEC driver:
    1. The new 87x and 88x series of processors have two FECs,
       and the new driver supports them both.
    2. Another change in the 87x/88x series is support for
       the RMII (Reduced MII) interface. However numerous
       changes are needed to make it work since the PHYs
       are connected to the same lines. That means that
       you have to address them correctly over the MII
       interface.
    3. We now correctly match the MII/RMII interface
       configuration to what the PHY reports.
  - Fix problem when readingthe MII status register. Due to the
    internal design of many PHYs you have to read the register
    twice. The problem is more apparent in 10Mbit mode.
  - add new mode ".jffs2s" for reading from a NAND device: it just
    skips over bad blocks.
  - add networking support for VLANs (802.1q), and CDP (Cisco
    Discovery Protocol)
  - some minor patches / cleanup

* Patch by Yuli Barcohen, 28 Mar 2004:
  - Add support for MPC8272 family including MPC8247/8248/8271/8272
  - Add support for MPC8272ADS evaluation board (another flavour of MPC8260ADS)
  - Change configuration method for MPC8260ADS family

* add startup code to clear the BSS of standalone applications

* Fix if / elif handling bug in HUSH shell

======================================================================
Changes for U-Boot 1.1.0:
======================================================================

* Patch by Mark Jonas: Remove config.tmp files only when
  unconfiguring the board

* Adapt RMU board for bigger flash memory

* Patch by Klaus Heydeck, 13 Mar 2003:
  Add support for KUP4X Board

* Patch by Pavel Bartusek, 21 Mar 2004
  Add Reiserfs support

* Patch by Hinko Kocevar, 20 Mar 2004
  - Add auto-release for SMSC LAN91c111 driver
  - Add save/restore of PTR and PNR regs as suggested in datasheet

* Patch by Stephen Williams, 19 March 2004
  Increase speed of sector reads from SystemACE,
  shorten poll timeout and remove a useless reset

* Patch by Tolunay Orkun, 19 Mar 2004:
  Make GigE PHY 1000Mbps Speed/Duplex detection conditional
  (CONFIG_PHY_GIGE)

* Patch by Brad Kemp, 18 Mar 2004:
  prevent machine checks during a PCI scan

* Patch by Pierre Aubert, 18 Mar 2004:
  Fix string cleaning in IDE identification

* Patch by Pierre Aubert, 18 Mar 2004:
  - Unify video mode handling for Chips & Technologies 69000 Video
    chip and Silicon Motion SMI 712/710/810 Video chip
  - Add selection of the video output (CRT or LCD) via 'videoout'
    environment variable for the Silicon Motion
  - README update

* Patch by Pierre Aubert, 18 Mar 2004:
  include/common.h typo fix

* Patches by Tolunay Orkun, 17 Mar 2004:
  - Add support for bd->bi_iic_fast[] initialization via environment
    variable "i2cfast" (CONFIG_I2CFAST)
  - Add "i2cfast" u-boot environment variable support for csb272

* Patch by Carl Riechers, 17 Mar 2004:
  Ignore '\0' characters in console input for use with telnet and
  telco pads.

* Patch by Leon Kukovec, 17 Mar 2004:
  typo fix for strswab prototype #ifdef

* Patches by Thomas Viehweger, 16 Mar 2004:
  - show PCI clock frequency on MPC8260 systems
  - add FCC_PSMR_RMII flag for HiP7 processors
  - in do_jffs2_fsload(), take load address from load_addr if not set
    explicit, update load_addr otherwise
  - replaced printf by putc/puts when no formatting is needed
    (smaller code size, faster execution)

* Patch by Phillippe Robin, 16 Mar 2004:
  avoid dereferencing NULL pointer in lib_arm/armlinux.c

* Patch by Stephen Williams, 15 Mar 2004:
  Fix CONFIG_SERIAL_SOFTWARE_FIFO documentation

* Patch by Tolunay Orkun, 15 Mar 2004:
  Initialize bi_opbfreq to real OPB frequency via get_OPB_freq()

* Patch by Travis Sawyer, 15 Mar 2004:
  Update CREDITS & MAINTAINERS files for PPC440GX & Ocotea port

* Add start-up delay to make sure power has stabilized before
  attempting to switch on USB on SX1 board.

* Patch by Josef Wagner, 18 Mar 2004:
  - Add support for MicroSys XM250 board (PXA255)
  - Add support for MicroSys PM828 board (MPC8280)
  - Add support for 32 MB Flash on PM825/826
  - new SDRAM refresh rate for PM825/PM826
  - added support for MicroSys PM520 (MPC5200)
  - replaced Query by Identify command in CPU86/flash.c
    to support 28F160F3B

* Fix wrap around problem with udelay() on ARM920T

* Add support for Macronix flash on TRAB board

* Patch by Pierre Aubert, 15 Mar 2004:
  Fix buffer overflow in IDE identification

* Fix power-off of LCD for out-of-band temperatures on LWMON board

* Remove redundand #define in IceCube.h

* Patch by Steven Scholz, 27 Feb 2004:
  - Adding get_ticks() and get_tbclk() for AT91RM9200
  - Many white space fixes in cpu/at91rm9200/interrupts.c

* Patches by Steven Scholz, 20 Feb 2004:
  some cleanup in AT91RM9200 related code

* Patches by Travis Sawyer, 12 Mar 2004:
  - Fix Gigabit Ethernet support for 440GX
  - Add Gigabit Ethernet Support to MII PHY utilities

* Patch by Brad Kemp, 12 Mar 2004:
  Fixes for drivers/cfi_flash.c:
  - Better support for x8/x16 implementations
  - Added failure for AMD chips attempting to use CFG_FLASH_USE_BUFFER_WRITE
  - Added defines for AMD command and address constants

* Patch by Leon Kukovec, 12 Mar 2004:
  Fix get_dentfromdir() to correctly handle deleted dentries

* Patch by George G. Davis, 11 Mar 2004:
  Remove hard coded network settings in TI OMAP1610 H2
  default board config

* Patch by George G. Davis, 11 Mar 2004:
  add support for ADS GraphicsClient+ board.

* Patch by Pierre Aubert, 11 Mar 2004:
  - add bitmap command and splash screen support in cfb console
  - add [optional] origin in the bitmap display command

* Patch by Travis Sawyer, 11 Mar 2004:
  Fix ocotea board early init interrupt setup.

* Patch by Thomas Viehweger, 11 Mar 2004:
  Remove redundand code; add  PCI-specific bits to include/mpc8260.h

* Patch by Stephan Linz, 09 Mar 2004
  - Add support for the SSV ADNP/ESC1 (Nios Softcore)

* Patch by George G. Davis, 9 Mar 2004:
  fix recent build failure for SA1100 target

* Patch by Travis Sawyer, 09 Mar 2004:
  Support native interrupt mode for the IBM440GX.
  Previously it was running in 440GP compatibility mode.

* Patch by Philippe Robin, 09 Mar 2004:
  Added ARM Integrator AP, CP and Versatile PB926EJ-S Reference
  Platform support.

* Patch by Masami Komiya, 08 Mar 2004:
  Don't overwrite server IP address or boot file name
  when the boot server does not return values

* Patch by Tolunay Orkun, 5 Mar 2004:
  Removed compile time restriction on CFG_I2C_SPEED for DS1338 RTC

* Patch by Tolunay Orkun, 5 Mar 2004:
  Fix early board initialization for Cogent CSB272 board

* Patch by Ed Okerson, 3 Mar 2004:
  fix CFI flash writes for little endian systems

* Patch by Reinhard Meyer, 01 Mar 2004:
  generalize USB and IDE support for MPC5200 with according
  changes to IceCube.h and TOP5200.h
  add Am29LV256 256 MBit FLASH support for TOP5200 boards
  add info about USB and IDE to README

* Patch by Yuli Barcohen, 4 Mar 2004:
  Fix problems with GCC 3.3.x which changed handling of global
  variables explicitly initialized to zero (now in .bss instead of
  .data as before).

* Patch by Leon Kukovec, 02 Mar 2004:
  add strswab() to fix IDE LBA capacity, firmware and model numbers
  on little endian machines

* Patch by Masami Komiya, 02 Mar 2004:
  - Remove get_ticks() from NFS code
  - Add verification of RPC transaction ID

* Patch by Pierre Aubert, 02 Mar 2004:
  cleanup for IDE and USB drivers for MPC5200

* Patch by Travis Sawyer, 01 Mar 2004:
  Ocotea:
  - Add IBM PPC440GX Ref Platform support (Ocotea)
    Original code by Paul Reynolds <PaulReynolds@lhsolutions.com>
    Adapted to U-Boot and 440GX port
  440gx_enet.c:
  - Add gracious handling of all Ethernet Pin Selections for 440GX
  - Add RGMII selection for Cicada CIS8201 Gigabit PHY
  ppc440.h:
  - Add needed bit definitions
  - Fix formatting

* Patch by Carl Riechers, 1 Mar 2004:
  Add PPC440GX prbdv0 divider to fix memory clock calculation.

* Patch by Stephan Linz, 27 Feb 2004
  - avoid problems for targets without NFS download support

* Patch by Rune Torgersen, 27 Feb 2004:
  - Added LBA48 support (CONFIG_LBA48 & CFG_64BIT_LBA)
  - Added support for 64bit printing in vsprintf (CFG_64BIT_VSPRINTF)
  - Added support for 64bit strtoul (CFG_64BIT_STRTOUL)

* Patch by Masami Komiya, 27 Feb 2004:
  Fix rarpboot: add autoload by NFS

* Patch by Dan Eisenhut, 26 Feb 2004:
  fix flash_write return value in saveenv

* Patch by Stephan Linz, 11 Dec 2003
  expand config.mk to avoid trigraph warnings on NIOS

* Rename "BMS2003" board into "HMI10"

* SX1 patches: use "serial#" for USB serial #; use redundand environment
  storage; auto-set console on USB port (using preboot command)

* Add support for SX1 mobile phone; add support for USB-based console
  (enable with "setenv stdout usbtty; setenv stdin usbtty")

* Fix LOWBOOT configuration for MPC5200 with DDR memory

* Fix SDRAM timings for LITE5200 / IceCube board

* Handle Auti-MDIX / connection status for INCA-IP

* Fix USB problems when attempting to read 0 bytes

* Patch by Travis Sawyer, 26 Feb 2004:
  Fix broken compile for XPEDITE1K target.

* Patch by Stephan Linz, 26 Feb 2004:
  Bug fix for NFS code on NIOS targets

* Patch by Stephen Williams, 26 Feb 2004:
  Break up SystemACE reads of large block counts

* Patch by Pierre Aubert, 26 Feb 2004
  add IDE support for MPC5200

* Patch by Masami Komiya, 26 Feb 2004:
  add autoload via NFS

* Patch by Stephen Williams
  Use of CONFIG_SERIAL_SOFTWARE_FIFO in board.c consistent with uses
  elsewhere in the source.

* Patch by Steven Scholz, 25 Feb 2004:
  - Timeouts in FPGA code should be based on CFG_HZ
  - Minor cleanup in code for Altera FPGA ACEX1K

* Patch by Steven Scholz, 25 Feb 2004:
  Changed "Directory Hierarchy" section in README

* Patch by Masami Komiya, 25 Feb 2004:
  Reduce copy count in nfs_read_reply() of NFS code

* Patch by Markus Pietrek, 24 Feb 2004:
  NS9750 DevBoard added

* Patch by Pierre Aubert, 24 Feb 2004
  add USB support for MPC5200

* Patch by Steven Scholz, 24 Feb 2004:
  - fix MII commands to use values from last command

* Patch by Torsten Demke, 24 Feb 2004:
  Add support for the eXalion platform (SPSW-8240, F-30, F-300)

* Patch by Rahul Shanbhag, 19 Feb 2004:
  Fixes for for OMAP1610 board:
  - shift some IRQ specific code to platform.S file
  - remove duplicatewatchdog reset code from start.S

* Make Auto-MDIX Support configurable on INCA-IP board

* Fix license for mkimage tool

* Patch by Masami Komiya, 24 Feb 2004:
  Update NetBootFileXferSize in NFS code

* Patch by Scott McNutt, 24 Feb 2004:
  fix packet length in NFS code

* Patch by Masami Komiy, 22 Feb 2004:
  Add support for NFS for file download

* Patch by Andrea Scian, 17 Feb 2004:
  Add support for S3C44B0 processor and DAVE B2 board

* Patch by Steven Scholz, 20 Feb 2004:
  - Add support for MII commands on AT91RM9200 boards
  - some cleanup in AT91RM9200 ethernet code

* Patch by Peter Ryser, 20 Feb 2004:
  Add support for the Xilinx ML300 platform

* Patch by Stephan Linz, 17 Feb 2004:
  Fix watchdog support for NIOS

* Patch by Josh Fryman, 16 Feb 2004:
  Fix byte-swapping for cfi_flash.c for different bus widths

* Patch by Jon Diekema, 14 Jeb 2004:
  Remove duplicate "FPGA Support" notes from the README file

* Patches by Reinhard Meyer, 14 Feb 2004:
  - update board/emk tree; use common flash driver
  - Corrected tested bits in machine check exception in cpu/mpc5xxx/traps.c
    [adapted for other PPC CPUs -- wd]
  - Added support for the M48T08 on the EVAL5200 board in rtc/mk48t59.c

* Patch by Jon Diekema, 13 Feb 2004:
  Call show_boot_progress() whenever POST "FAILED" is printed.

* Patch by Nishant Kamat, 13 Feb 2004:
  Add support for TI OMAP1610 H2 Board
  Fixes for cpu/arm926ejs/interrupt.c
	(based on Richard Woodruff's patch for arm925, 16 Oct 03)
  Fix for a timer bug in OMAP1610 Innovator
  Add support for CS0 (ROM)/CS3 (Flash) boot in OMAP1610 Innovator and H2

* Patches by Stephan Linz, 12 Feb 2004:
  - add support for NIOS timer with variable period preload counter value
  - prepare POST framework support for NIOS targets

* Patch by Denis Peter, 11 Feb 2004:
  add POST support for the MIP405 board

* Patch by Laurent Mohin, 10 Feb 2004:
  Fix buffer overflow in common/usb.c

* Patch by Tolunay Orkun, 10 Feb 2004:
  Add support for Cogent CSB272 board

* Patch by Thomas Elste, 10 Feb 2004:
  Add support for NET+50 CPU and ModNET50 board

* Patch by Sam Song, 10 Feb 2004:
  Fix typos in cfi_flash.c

* Patch by Leon Kukovec, 10 Feb 2004
  Fixed long dir entry slot id calculation in get_vfatname

* Patch by Robin Gilks, 10 Feb 2004:
  add "itest" command (operators: -eq, -ne, -lt, -gt, -le, -ge, ==,
  !=, <>, <, >, <=, >=)

* Fix problem with side effects in macros in include/usb.h

* Patch by David Benson, 13 Nov 2003:
  bug 841358 - fix TFTP download size limit

* Fixing bug 850768:
  improper flush_cache() in load_serial()

* Fixing bug 834943:
  MPC8540 - missing volatile declarations

* Patch by Stephen Williams, 09 Feb 2004:
  Add support for Xilinx SystemACE chip:
  - New files common/cmd_ace.c and include/systemace.h
  - Hook systemace support into cmd_fat and the partition manager

* Patch by Travis Sawyer, 09 Feb 2004:
  Add bi_opbfreq & bi_iic_fast to 440GX bd_info as needed for Linux

* Patch by Travis Sawyer, 09 Feb 2004:
  o 440GX:
    - Fix PCI Indirect access for type 1 config cycles with ppc440.
    - Add phymode for 440 enet
    - fix pci pre init
  o XPedite1K:
    - Change board_pre_init to board_early_init_f
    - Add user flash to bus controller setup
    - Fix pci pre init
    - Fix is_pci_host to check GPIO for monarch bit
    - Force xpedite1k to pci conventional mode (via #define option)

* Patch by Brad Kemp, 4 Feb 2004:
  - handle the machine check that is generated during the PCI scans
    on 82xx processors.
  - define the registers used in the IMMR by the PCI subsystem.

* Patch by Pierre Aubert, 03 Feb 2004:
  cpu/mpc5xxx/start.S: copy MBAR into SPR311

* Patch by Jeff Angielski, 03 Feb 2004:
  Fix copy & paste error in cpu/mpc8260/pci.c

* Patch by Reinhard Meyer, 24 Jan 2004:
  Fix typo in cpu/mpc5xxx/pci_mpc5200.c

* Add Auto-MDIX support for INCA-IP

* Some code cleanup

* Patch by Josef Baumgartner, 10 Feb 2004:
  Fixes for Coldfire port

* Patch by Brad Kemp, 11 Feb 2004:
  Fix CFI flash driver problems

* Make sure to use a bus clock divider of 2 only when running TQM8xxM
  modules at CPU clock frequencies above 66 MHz.

* Optimize flash programming speed for LWMON (by another 100% :-)

* Patch by Jian Zhang, 3 Feb 2004:
  - Changed the incorrect FAT12BUFSIZE
  - data_begin in fsdata can be negative. Changed it to be short.

* Patches by Stephan Linz, 30 Jan 2004:
  1: - board/altera/common/flash.c:flash_erase():
       o allow interrupts befor get_timer() call
       o check-up each erased sector and avoid unexpected timeouts
     - board/altera/dk1c20/dk1s10.c:board_early_init_f():
       o enclose sevenseg_set() in cpp condition
     - remove the ASMI configuration for DK1S10_standard_32 (never present)
     - fix some typed in mistakes in the NIOS documentation
  2: - split DK1C20 configuration into several header files:
       o two new files for each NIOS CPU description
       o U-Boot related part is remaining in DK1C20.h
  3: - split DK1S10 configuration into several header files:
       o two new files for each NIOS CPU description
       o U-Boot related part is remaining in DK1S10.h
  4: - Add support for the Microtronix Linux Development Kit
       NIOS CPU configuration at the Altera Nios Development Kit,
       Stratix Edition (DK-1S10)
  5: - Add documentation for the Altera Nios Development Kit,
       Stratix Edition (DK-1S10)
  6: - Add support for the Nios Serial Peripharel Interface (SPI)
       (master only)
  7: - Add support for the common U-Boot SPI framework at
       RTC driver DS1306

* Patch by Rahul Shanbhag, 28 Jan 2004:
  Fix flash protection/locking handling for OMAP1610 innovator board.

* Patch by Rolf Peukert, 28 Jan 2004:
  fix flash write problems on CSB226 board (write with 32 bit bus width)

* Patches by Mark Jonas, 16 Jan 2004:
  - fix rounding error when calculating baudrates for MPC5200 PSCs
  - make sure CFG_RAMBOOT and CFG_LOWBOOT are not enabled at the same
    time which is not supported

* Patch by Yuli Barcohen, 26 Jan 2004:
  Allow bzip2 compression for small memory footprint boards

* Patch by Brad Kemp, 21 Jan 2004:
  Add support for CFI flash driver for both the Intel and the AMD
  command sets.

* Patch by Travis Sawyer, 20 Jan 2004:
  Fix pci bridge auto enumeration of sibling p2p bridges.

* Patch by Tolunay Orkun, 12 Jan 2004:
  Add some delays as needed for Intel LXT971A PHY support

* Patches by Stephan Linz, 09 Jan 2004:
  - avoid warning: unused variable `piop' in board/altera/common/sevenseg.c
  - make DK1C20 board configuration related to ASMI conform to
    documentation

* Patch by Anders Larsen, 09 Jan 2004:

  ARM memory layout fixes: the abort-stack is now set up in the
  correct RAM area, and the BSS is zeroed out as it should be.

  Furthermore, the magic variables 'armboot_end' and 'armboot_end_data'
  of the linker scripts are replaced by '__bss_start' and '_end',
  resp., which is a further step to eliminate unnecessary differences
  between the implementation of the CPU architectures.

* Patch by liang a lei, 9 Jan 2004:
  Fix Intel 28F128J3 ID in include/flash.h

* Patch by Masami Komiya, 09 Jan 2004:
  add support for TB0229 board (NEC VR4131 MIPS processor)

* Patch by Leon Kukovec, 12 Dec 2003:
  changed extern __inline__ into static __inline__ in
  include/linux/byteorder/swab.h

* Patch by Travis Sawyer, 30 Dec 2003:
  Add support for IBM PPC440GX. Multiple EMAC Ethernet devices,
  select MDI port based on enabled EMAC device.
  Add support for XES Inc <http://www.xes-inc.com> XPedite1000 440GX
  base PrPMC board.

* Patch by Wolter Kamphuis, 15 Dec 2003:
  made CONFIG_SILENT_CONSOLE usable on all architectures

* Disable date command on TQM866M - there is no RTC on MPC866

* Fix variable CPU clock for MPC859/866 systems for low CPU clocks

* Implement adaptive SDRAM timing configuration based on actual CPU
  clock frequency for INCA-IP; fix problem with board hanging when
  switching from 150MHz to 100MHz

* Add PCMCIA CS support for BMS2003 board

* Add variable CPU clock for MPC859/866 systems (so far only TQM866M):
  see doc/README.MPC866 for details;
  implement workaround for "SIU4" and "SIU9" silicon bugs on MPC866;
  calculate CPU clock frequency from PLL register values.

* Add support for 128 MB RAM on TQM8xxL/M modules

* Fix PS/2 keyboard problem caused by statically initialized variable
  pointing to a location in flash

* Fix INCA-IP clock calculation: 400/3 = 133.3 MHz, not 130.

* The PS/2 mux on the BMS2003 board needs 450 ms after power on
  before we can access it; add delay in case we are faster (with no
  CF card inserted)

* Cleanup of some init functions

* Make sure SCC Ethernet is always stopped by the time we boot Linux
  to avoid Linux crashes by early packets coming in.

* Accelerate flash accesses on LWMON board by using buffered writes

* Fix typo in Makefile;
  fix problem with PARTNUM detection

* Patch by Reinhard Meyer, 09 Jan 2004:
  - add RTC support for MPC5200 based boards (requires RTC_XTAL)

* Add support for IDE LED on BMS2003 board
  (exclusive with status LED!)

* Add support for PS/2 keyboard (used with PS/2 multiplexor on
  BMS2003 board)

* Patches by Reinhard Meyer, 4 Jan 2004 + 7 Jan 2004:
  Add common files for "emk" boards

* Add a common get_ram_size() function and modify the the
  board-specific files to invoke that common implementation.

======================================================================
Changes for U-Boot 1.0.1:
======================================================================

* Set default clock for INCA-IP to 150 MHz

* Make BMS2003 use a separate config file to avoid #ifdef mess;
  add I2C support; add support for DS1337 RTC

* Add CompactFlash support  for BMS2003 board

* Add support for status LED on BMS2003 board

* Patch by Scott McNutt, 02 Jan 2004:
  Add support for the Nios Active Serial Memory Interface (ASMI)
  on Cyclone devices

* Patch by Andrea Marson, 16 Dec 2003:
  Add support for the PPChameleon ME and HI modules

* Patch by Yuli Barcohen, 22 Dec 2003:
  Add support for Motorola DUET ADS board (MPC87x/88x)

* Patch by Robert Schwebel, 15 Dec 2003:
  add support for cramfs (uses JFFS2 command interface)

* Patches by Stephan Linz, 11 Dec 2003:
  - more documentation for NIOS port
  - new struct nios_pio_t, struct nios_spi_t
  - Reconfiguration for NIOS Development Kit DK1C20:
    o move board related code from board/dk1c20
      to board/altera/dk1c20
    o create a new common source path board/altera/common
      and move generic flash access stuff into it
    o change/expand configuration file DK1C20.h
  - Add support for NIOS Development Kit DK1S10
  - Add status LED support for NIOS systems
  - Add dual 7-segment LED support for Altera NIOS DevKits

* Patch by Ronen Shitrit, 10 Dec 2003:
  Add support for the Marvell DB64360 / DB64460 development boards

* Patch by Detlev Zundel, 10 Dec 2003:
  fix dependency problem in examples/Makefile

* Patch by Denis Peter, 8 Dec 2003
  - add support for the PATI board (MPC555)
  - add SPI support for the MPC5xx

* Patch by Anders Larsen, 08 Dec 2003:
  add configuration options CONFIG_SERIAL_TAG and CONFIG_REVISION_TAG
  to pass ATAG_SERIAL and ATAG_REVISION, resp., to the ARM target;
  cleanup some redundand #defines