[U-Boot] [PATCH v2 0/9] MIPS: improve start.S and add exception support

[Daniel Schwierzeck]

Am 03.10.2016 um 19:51 schrieb Daniel Schwierzeck:
> Fix and optinmize initialization of cp0 registers. Also add
> the possibilty to setup the initial stack and global data in
> SRAM to provide a C environment for lowlevel_init(). This
> could be used on the QCA ath79 platform to rewrite and
> optimize the low-level init code.
> 
> Add support for a dynamic exception vectors in RAM and add
> initial exception handlers. The general exception handler
> prints an oops message similar to Linux kernel and then hangs.
> The EJTAG exception handler checks for SDBBP and delegates to
> the SDBBP handler if necessary. Otherwise the debug mode
> will be simply exited. The SDBBP handler currently only
> prints the content of registers c0_depc and c0_debug. This
> could be extended in the future to handle semi-hosting
> according to the MIPS UHI specification.
> 
> This patch series is also available at:
> git://git.denx.de/u-boot-mips.git mips_rework_start_v2
> 
> Changes in v2:
> - invoke UHI exception operation for all exception vectors but
>   the EJTAG debug exception
> - use EHB after setting cp0 status
> - reordered macros in genex.S to allow side-by-side diff with Linux's
>   arch/mips/include/asm/stackframe.h
> - sync'ed genex.S with Linux v4.8-rc8 to incorporate changes for
>   MIPS r6
> - add execution_hazard_barrier() after clearing c0 status.BEV
> 
> Daniel Schwierzeck (9):
>   MIPS: make inclusion of ROM exception vectors configurable
>   MIPS: fix ROM exception vectors
>   MIPS: fix iand optimize setup of CP0 registers
>   MIPS: factor out code for initial stack and global data
>   MIPS: add possibility to setup initial stack and global data in SRAM
>   MIPS: add asm-offsets for struct pt_regs
>   MIPS: reserve space for exception vectors
>   MIPS: add handling for generic and EJTAG exceptions
>   common/board_f: enable initr_trap for MIPS
> 
>  arch/mips/Kconfig                   |  32 ++++++
>  arch/mips/cpu/start.S               | 174 ++++++++++++++++++----------
>  arch/mips/include/asm/asm-offsets.h |   5 +
>  arch/mips/include/asm/mipsregs.h    |   1 +
>  arch/mips/include/asm/system.h      |   8 ++
>  arch/mips/include/asm/u-boot-mips.h |   4 +
>  arch/mips/lib/Makefile              |   3 +
>  arch/mips/lib/asm-offsets.c         |  61 ++++++++++
>  arch/mips/lib/genex.S               | 224 ++++++++++++++++++++++++++++++++++++
>  arch/mips/lib/stack.c               |  19 +++
>  arch/mips/lib/traps.c               | 106 +++++++++++++++++
>  arch/mips/mach-ath79/Kconfig        |   2 +
>  arch/mips/mach-pic32/Kconfig        |   1 +
>  common/board_r.c                    |   4 +-
>  14 files changed, 581 insertions(+), 63 deletions(-)
>  create mode 100644 arch/mips/include/asm/asm-offsets.h
>  create mode 100644 arch/mips/lib/asm-offsets.c
>  create mode 100644 arch/mips/lib/genex.S
>  create mode 100644 arch/mips/lib/stack.c
>  create mode 100644 arch/mips/lib/traps.c
> 

applied to u-boot-mips/next

-- 
- Daniel

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