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https://github.com/AsahiLinux/u-boot
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25e7d4bf64
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>
36 lines
625 B
C
36 lines
625 B
C
// SPDX-License-Identifier: GPL-2.0+
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#include <debug_uart.h>
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#include <asm/sbi.h>
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#ifdef CONFIG_SBI_V01
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static inline void _debug_uart_init(void)
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{
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}
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static inline void _debug_uart_putc(int c)
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{
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if (CONFIG_IS_ENABLED(RISCV_SMODE))
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sbi_console_putchar(c);
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}
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#else
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static int sbi_dbcn_available __section(".data");
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static inline void _debug_uart_init(void)
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{
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if (CONFIG_IS_ENABLED(RISCV_SMODE))
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sbi_dbcn_available = sbi_probe_extension(SBI_EXT_DBCN);
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}
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static inline void _debug_uart_putc(int ch)
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{
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if (CONFIG_IS_ENABLED(RISCV_SMODE) && sbi_dbcn_available)
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sbi_dbcn_write_byte(ch);
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}
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#endif
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DEBUG_UART_FUNCS
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