On ARM v7M, the processor will return to ARM mode when executing a blx instruction with bit 0 of the address == 0. Always set it to 1 to stay in thumb mode.
Signed-off-by: Matt Porter mporter@konsulko.com --- common/cmd_boot.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/common/cmd_boot.c b/common/cmd_boot.c index 8f2e070..20ce652 100644 --- a/common/cmd_boot.c +++ b/common/cmd_boot.c @@ -38,6 +38,10 @@ static int do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) * pass address parameter as argv[0] (aka command name), * and all remaining args */ +#ifdef CONFIG_CPU_V7M + /* For ARM V7M, set bit zero to stay in Thumb mode */ + addr++; +#endif rc = do_go_exec ((void *)addr, argc - 1, argv + 1); if (rc != 0) rcode = 1;