3 commits

Author	SHA1	Message	Date
Heinrich Schuchardt	25e7d4bf64	serial: move sbi_dbcn_available to .data section ... U-Boot SPL loads the device-tree directly behind main U-Boot overlapping the .bss section. reserve_fdt() is called in board_init_f() to relocate the device-tree to a safe location. Debug UARTs are enabled before board_init_f(). With sbi_dbcn_available in the .bss section the device-tree is corrupted when _debug_uart_init() is called in the SBI serial driver. Move the variable to the .data section. Link: https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/2054091 Fixes: dfe0837494 ("risc-v: implement DBCN based debug console") Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Tested-by: Aurelien Jarno <aurelien@aurel32.net> Tested-by: Conor Dooley <conor.dooley@microchip.com>	2024-03-12 14:36:13 +08:00
Heinrich Schuchardt	dfe0837494	risc-v: implement DBCN based debug console ... Use the DBCN SBI extension to implement a debug console. Make it the default for S-mode RISC-V. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>	2023-09-05 10:53:55 +08:00
Samuel Holland	41f7be7334	serial: Add a debug console using the RISC-V SBI interface ... The RISC-V SBI interface v0.1 provides a function for printing a character to the console. Even though SBI v0.1 functions are deprecated, the SBI console is quite useful for early debugging, because it works without any dcache, memory, or MMIO access in S mode. Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>	2021-10-07 16:08:23 +08:00