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 function to debug early exceptions. The plan is to elimiate platform specific early_printk and cps-vec-ns16550 by debug_ll and earlycon. cps-vec-ns16550 is leave unchanged for now due to pending patch[1]. Hope you'll find them handy :-) Happy hacking! Thanks Jiaxun [1]: https://lore.kernel.org/linux-mips/20231027221106.405666-6-jiaxun.yang@xxxxxxxxxxx/ Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> --- Jiaxun Yang (8): 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 arch/mips/Kconfig | 12 +- arch/mips/Kconfig.debug | 212 +++++++++++++++++++++++++++---- arch/mips/boot/compressed/Makefile | 9 +- arch/mips/boot/compressed/dbg.c | 37 ------ arch/mips/boot/compressed/debug-vec.S | 3 + arch/mips/boot/compressed/debug.S | 3 + arch/mips/boot/compressed/decompress.c | 6 +- arch/mips/boot/compressed/head.S | 6 + arch/mips/boot/compressed/uart-16550.c | 47 ------- arch/mips/boot/compressed/uart-alchemy.c | 7 - arch/mips/boot/compressed/uart-ath79.c | 2 - arch/mips/boot/compressed/uart-prom.c | 7 - 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 | 3 + 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 + 22 files changed, 750 insertions(+), 148 deletions(-) --- base-commit: 66f1e1ea3548378ff6387b1ce0b40955d54e86aa change-id: 20231028-mips_debug_ll-ef9cce16767b Best regards, -- Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
