I am working on mpc8548cds board … Feature : POST DIAGNOSTICS; In u-boot : post/memory.c,cpu.c..etc.. Need your suggestion… There is function pointers in post.c which calls the respective function to perform diag test ( example ram , cpu, ether ..etc ) which will be picked from tests.c ( This is the structure which defines all the fileds of the tests) Function pointer defined in post.c static int post_run_single (struct post_test *test, int test_flags, int flags, unsigned int i) { … .. if ((*test->test) (flags) != 0) { ( This function pointers will call cpu tests from post/cpu.c defined below based tested entered from u-boot promt ) post_log ("FAILED\n") } else { post_log ("PASSED\n") } ------------------------------------------------------------------------------------------------------------ CASE 1 Experiment : Post/cpu.c int cpu_post_test (int flags) { int ic = icache_status (); int ret = 0; int c; post_result_cpu = 0; cpu_dbg = 0; boot_flag_post = 0; printf( “ Testing cpu diag \n”); à TRAP IS Generated and box got rebooted. Other part of code exits.. }
From u-boot prompt.
=>diag run cpu By log I verfied that this TRAP is generated from the post/cpu.c because of printf NIP: 00000000 XER: 00000000 LR: FFF25C40 REGS: 3feed878 TRAP: 0700 DAR: 00000004 MSR: 00029200 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 00 GPR00: 00000004 3FEED968 00000200 3FEEDA18 3FEEDA18 3FEEDA08 FFFFFFF4 00000007 GPR08: 00000000 00000000 FFFFFFFF 3FEED918 44028042 00000000 3FFBBC00 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 3FEF0378 00000003 0000000C GPR24: 3FEF0350 00000600 00000002 00000600 3FEEDA18 3FEEDF90 FFF4D3BC 00000000 ** Illegal Instruction ** Call backtrace: 3FF73310 FFF25DB8 FFF25E38 FFF338A0 3FFA2FAC 3FFA3564 3FF8D620 3FF98820 3FF98E98 3FF99000 3FF8AE44 3FF81DA8 3FF72628 Program Check Exception NIPÞ CASE 2 Experiment: Post/cpu.c int cpu_post_test (int flags) { int ic = icache_status (); int ret = 0; int c; post_result_cpu = 0; cpu_dbg = 0; boot_flag_post = 0; < Removed or commented the printf statement > return 0; NO TRAP is Generated. . } Another approach to validate the post/cpu.c fuction. Is working correctly or not. In file post.c Declared this API and directly called cpu_post_test(flags) before the function pointers. This API executed correctly with out a TRAP and results were displayed correctly. extern int cpu_post_test (int flags); static int post_run_single (struct post_test *test, int test_flags, int flags, unsigned int i) { ret = cpu_post_test(flags); #if 0 if ((*test->test) (flags) != 0) { post_log ("FAILED\n") } else { post_log ("PASSED\n") } #iendif Could u please let me know how do I avoid this TRAP when I am using the function pointers.. CASE 1 Experiment: Regards, Rajshekar