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_v1
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 | 165 +++++++++++++++++---------- arch/mips/include/asm/asm-offsets.h | 5 + arch/mips/include/asm/mipsregs.h | 1 + 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 | 214 ++++++++++++++++++++++++++++++++++++ arch/mips/lib/stack.c | 19 ++++ arch/mips/lib/traps.c | 104 ++++++++++++++++++ arch/mips/mach-ath79/Kconfig | 2 + arch/mips/mach-pic32/Kconfig | 1 + common/board_r.c | 4 +- 13 files changed, 552 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