On ARM v7M, the processor will return to ARM mode when executing blx instruction with bit 0 of the address == 0. Always set it to 1 to stay in thumb mode.
At present, it is applied only for raw U-Boot. This patch moves it to just before booting next image. This way armv7m will be in thumb mode for any image like raw or image with header like zImage or standard U-Boot.
Signed-off-by: Vikas Manocha vikas.manocha@st.com ---
Changed in v2: Added this patch in v2
common/spl/spl.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/common/spl/spl.c b/common/spl/spl.c index df984b8..1bdae3e 100644 --- a/common/spl/spl.c +++ b/common/spl/spl.c @@ -121,9 +121,6 @@ void spl_set_header_raw_uboot(struct spl_image_info *spl_image) { spl_image->size = CONFIG_SYS_MONITOR_LEN; spl_image->entry_point = CONFIG_SYS_UBOOT_START; -#ifdef CONFIG_CPU_V7M - spl_image->entry_point |= 0x1; -#endif spl_image->load_addr = CONFIG_SYS_TEXT_BASE; spl_image->os = IH_OS_U_BOOT; spl_image->name = "U-Boot"; @@ -396,6 +393,9 @@ void board_init_r(gd_t *dummy1, ulong dummy2) hang(); }
+#ifdef CONFIG_CPU_V7M + spl_image.entry_point |= 0x1; +#endif switch (spl_image.os) { case IH_OS_U_BOOT: debug("Jumping to U-Boot\n");