Hi all, This is a attempt to bring all low-level debugging print functions together and provide a arm-like low-level debugging interface and a further capability to debug early exceptions. This patch elimiate platform specific early_printk, zboot printing functions and cps-vec-ns16550 by newly introduced debug_ll. Hope you'll find them handy :-) Happy hacking! Thanks Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> --- Changes in v3: - Collect review tags - Fix an indentation - Link to v2: https://lore.kernel.org/r/20240326-mips_debug_ll-v2-0-b64abc76f2a1@xxxxxxxxxxx --- Jiaxun Yang (9): MIPS: asm: Move strings to .rodata.str section MIPS: debug: Implement low-level debugging functions MIPS: debug: Hook up DEBUG_LL with early printk MIPS: debug: Provide an early exception vector for low-level debugging MIPS: debug_ll: Add Kconfig symbols for some 8250 uarts MIPS: debug_ll: Implement support for Alchemy uarts MIPS: debug_ll: Implement support for AR933X uarts MIPS: zboot: Convert to use debug_ll facilities MIPS: CPS: Convert to use debug_ll facilities arch/mips/Kconfig | 12 +- arch/mips/Kconfig.debug | 240 +++++++++++++++++++++++-------- arch/mips/boot/compressed/Makefile | 9 +- arch/mips/boot/compressed/dbg.c | 39 ----- arch/mips/boot/compressed/debug-vec.S | 3 + arch/mips/boot/compressed/debug.S | 3 + arch/mips/boot/compressed/decompress.h | 8 +- arch/mips/boot/compressed/head.S | 6 + arch/mips/boot/compressed/uart-16550.c | 49 ------- arch/mips/boot/compressed/uart-alchemy.c | 9 -- arch/mips/boot/compressed/uart-ath79.c | 2 - arch/mips/boot/compressed/uart-prom.c | 9 -- arch/mips/include/asm/asm.h | 2 +- arch/mips/include/debug/8250.S | 60 ++++++++ arch/mips/include/debug/alchemy.S | 46 ++++++ arch/mips/include/debug/ar933x.S | 41 ++++++ arch/mips/include/debug/uhi.S | 48 +++++++ arch/mips/kernel/Makefile | 4 +- arch/mips/kernel/cps-vec.S | 16 +-- arch/mips/kernel/debug-vec.S | 194 +++++++++++++++++++++++++ arch/mips/kernel/debug.S | 130 +++++++++++++++++ arch/mips/kernel/early_printk.c | 19 +++ arch/mips/kernel/head.S | 4 + 23 files changed, 756 insertions(+), 197 deletions(-) --- base-commit: 084c8e315db34b59d38d06e684b1a0dd07d30287 change-id: 20240326-mips_debug_ll-ce72fee1b6a2 Best regards, -- Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
