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arch: riscv: support kernel command line forcing when no DTB passed

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CONFIG_CMDLINE_FORCE doesn't work on RISC-V when no DTB is passed into
the kernel.  This is because the code that forces the kernel command
line only runs if a valid DTB is present at boot.  During debugging,
it's useful to have the ability to force kernel command lines even
when no DTB is present.  This patch adds support for doing so.

Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org
Cc: linux-kernel@vger.kernel.org (open list)
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Paul Walmsley 2018-12-17 19:15:12 -08:00 committed by Palmer Dabbelt
parent d0df00e30e
commit 8fd6e05c74
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1 changed files with 8 additions and 1 deletions
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9
arch/riscv/kernel/setup.c
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@ -149,7 +149,14 @@ asmlinkage void __init setup_vm(void)
void __init parse_dtb(unsigned int hartid, void *dtb) void __init parse_dtb(unsigned int hartid, void *dtb)
{ {
early_init_dt_scan(__va(dtb)); if (!early_init_dt_scan(__va(dtb)))
return;
pr_err("No DTB passed to the kernel\n");
#ifdef CONFIG_CMDLINE_FORCE
strlcpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
pr_info("Forcing kernel command line to: %s\n", boot_command_line);
#endif
} }
static void __init setup_bootmem(void) static void __init setup_bootmem(void)