From: Patrice Chotard patrice.chotard@st.com

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.

Tested on STM32f746-disco board

Similar commit: f99993c10882f7dc8ec35993d5febe59aac01e6a Author: Matt Porter mporter@konsulko.com

Signed-off-by: Patrice Chotard patrice.chotard@st.com --- arch/arm/lib/bootm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index 8125cf0..6b1d3ae 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -347,7 +347,10 @@ static void boot_jump_linux(bootm_headers_t *images, int flag) int fake = (flag & BOOTM_STATE_OS_FAKE_GO);

kernel_entry = (void (*)(int, int, uint))images->ep; - +#ifdef CONFIG_CPU_V7M + ulong addr = (ulong)kernel_entry | 1; + kernel_entry = (void *)addr; +#endif s = getenv("machid"); if (s) { if (strict_strtoul(s, 16, &machid) < 0) {