Hi, I get a big headache when porting u-boot to the MPC8540 system. the problem is in the "printf" function of the "console.c" file, the following is the dump file ------------------------------------------------------------------------ void printf (const char *fmt, ...) { fff99308: 94 21 fe 50 stwu r1,-432(r1) fff9930c: 7c 08 02 a6 mflr r0 fff99310: 90 01 01 b4 stw r0,436(r1) fff99314: 39 61 00 0c addi r11,r1,12 va_list args; uint i; char printbuffer[CFG_PBSIZE];
va_start (args, fmt); fff99318: 38 00 00 01 li r0,1 fff9931c: 7c 8b e5 aa stswi r4,r11,28 fff99320: 98 01 00 70 stb r0,112(r1) fff99324: bf 81 01 a0 stmw r28,416(r1) fff99328: 38 00 00 00 li r0,0 ... ... ... ... ... ... ... -------------------------------------------------------------------------- when I traced into this function, unexpected interrupt occurs on the "fff99318 38 00 00 01 li r0,1" and the compiling log is as follows: ppc-linux-gcc -g -Os -fPIC -ffixed-r14 -meabi -D__KERNEL__ -DTEXT_BASE=0xfff80000 -I/home/aubrey/ppc-linux/u-boot/include -fno-builtin -ffreestanding -nostdinc -isystem /home/aubrey/ppc-linux/eldk/usr/bin/../lib/gcc-lib/ppc-linux/3.3.3/include -pipe -DCONFIG_PPC -D__powerpc__ -DCONFIG_MPC85xx -DCONFIG_E500 -ffixed-r2 -ffixed-r29 -Wa,-me500 -msoft-float -DCONFIG_MPC85xx=1 -DCONFIG_MPC8540=1 -DCONFIG_E500=1 -Wall -Wstrict-prototypes -c -o console.o console.c I don't know how to solve this problem. Any comment and suggestion will be welcome!