From dc89c6fb778ed2d12128e2bb976a45d540afce71 Mon Sep 17 00:00:00 2001 From: Patrice Chotard Date: Tue, 25 Apr 2017 11:07:46 +0200 Subject: [PATCH] arm/lib/bootm.c: keep ARM v7M in thumb mode during boot_jump_linux() 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 Signed-off-by: Patrice Chotard --- 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 426bee6..4dbe6a5 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -356,7 +356,10 @@ 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) {