修改DO2-DO4初始为低

hc

2023-10-16 def2367077573b56f9fc4f824e5c0377a3a4175a

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// SPDX-License-Identifier: GPL-2.0
#include <asm/setup.h>
 
void putc(char c)
{
    prom_putchar(c);
}