[U-Boot] [PATCH v4 0/2] Factorize ARM startup code as mush as possible.

[Albert ARIBAUD]

The goal of this series is to scrub the start.S files
which have proliferated across arch/arm and eliminate
code redundancy.

This series only factorizes the C runtime framework,
that is, the assembly code responsible for setting up
the C environments needed by board_init_*() and
relocate_code().

Further factorization is possible: relocate_code() can
be moved out and possibly rewritten in C now that it
has plain C function semantics; exception handlers
should also be pretty much cpu-independent.

Also, SPL currently makes board_init_f() perform all
of the setting up, including BSS clearing and chain-
loading. This could be streamlined by only putting
basic inits in board_init_f(), letting crt0 do the
BSS initialization and chain-loading U-Boot from
inside board_init_r().

Eventually, start.S files should disappear or contain
CPU-specific code only.

The new C runtime setup sequence has been validated step by
step on targets versatileqemu using gcc version 4.2.2 from
the ELDK4.2 toolchain, and wireless_space using gcc version
4.7.2 (Ubuntu/Linaro 4.7.2-1ubuntu1).

The whole changes have been build-tested across all ARM
targets using MAKEALL -a arm.

Changes in v4:
- fixed bhs into blo in BSS init loop
- switched from explicit literals to '=target' notation
- fixed location of GD in initial environment
- stopped SPL boot sequence at calling board_init_f

Changes in v3:
- various clarifications and typo fixes
- fixed wrong LED calls conditional
- fixed open comment eating some code
- fixed code overrun in SPL case

Changes in v2:
- moved description from cover letter to patch commit msg
- added note about tests in the cover letter
- fixed baords with CONFIG_SPL but not CONFIG_SPL_STACK
- removed useless includes in arm926ejs and arm925t

Albert ARIBAUD (2):
  arm: move C runtime setup code in crt0.S
  arm: remove useless code in start.S files

 arch/arm/cpu/arm1136/start.S              |   71 +++---------
 arch/arm/cpu/arm1176/start.S              |   62 ++---------
 arch/arm/cpu/arm720t/start.S              |   53 ++-------
 arch/arm/cpu/arm920t/start.S              |   61 ++--------
 arch/arm/cpu/arm925t/start.S              |   65 ++---------
 arch/arm/cpu/arm926ejs/start.S            |   86 ++------------
 arch/arm/cpu/arm946es/start.S             |   56 ++--------
 arch/arm/cpu/arm_intcm/start.S            |   63 ++---------
 arch/arm/cpu/armv7/start.S                |   58 +++-------
 arch/arm/cpu/ixp/start.S                  |   55 ++-------
 arch/arm/cpu/pxa/start.S                  |   63 ++---------
 arch/arm/cpu/s3c44b0/start.S              |   55 ++-------
 arch/arm/cpu/sa1100/start.S               |   50 ++-------
 arch/arm/lib/Makefile                     |    2 +
 arch/arm/lib/board.c                      |   11 --
 arch/arm/lib/crt0.S                       |  173 +++++++++++++++++++++++++++++
 include/common.h                          |    2 +-
 include/configs/socfpga_cyclone5.h        |    2 +-
 lib/asm-offsets.c                         |   10 ++
 nand_spl/board/freescale/mx31pdk/Makefile |    6 +-
 nand_spl/board/karo/tx25/Makefile         |    6 +-
 21 files changed, 322 insertions(+), 688 deletions(-)
 create mode 100644 arch/arm/lib/crt0.S

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1.7.10.4