feat(st): protect UART during platform init
Protect the UART instance used for serial boot
with UART used for console.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Change-Id: Ieee1557b34e7baa81594c3fbf0513191737027bf
diff --git a/plat/st/common/stm32mp_common.c b/plat/st/common/stm32mp_common.c
index 9cbba04..072155f 100644
--- a/plat/st/common/stm32mp_common.c
+++ b/plat/st/common/stm32mp_common.c
@@ -161,6 +161,8 @@
unsigned int console_flags;
uint32_t clk_rate;
int result;
+ uint32_t boot_itf __unused;
+ uint32_t boot_instance __unused;
result = dt_get_stdout_uart_info(&dt_uart_info);
@@ -171,6 +173,15 @@
return -ENODEV;
}
+#if STM32MP_UART_PROGRAMMER || !defined(IMAGE_BL2)
+ stm32_get_boot_interface(&boot_itf, &boot_instance);
+
+ if ((boot_itf == BOOT_API_CTX_BOOT_INTERFACE_SEL_SERIAL_UART) &&
+ (get_uart_address(boot_instance) == dt_uart_info.base)) {
+ return -EACCES;
+ }
+#endif
+
#if defined(IMAGE_BL2)
if (dt_set_stdout_pinctrl() != 0) {
return -ENODEV;