diff options
Diffstat (limited to 'drivers/st/uart/aarch32/stm32_console.S')
| -rw-r--r-- | drivers/st/uart/aarch32/stm32_console.S | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/st/uart/aarch32/stm32_console.S b/drivers/st/uart/aarch32/stm32_console.S index 686b18b96..2b8879a11 100644 --- a/drivers/st/uart/aarch32/stm32_console.S +++ b/drivers/st/uart/aarch32/stm32_console.S @@ -1,5 +1,5 @@ /* - * Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ @@ -45,7 +45,12 @@ func console_stm32_core_init /* Check the input base address */ cmp r0, #0 beq core_init_fail -#if defined(IMAGE_BL2) +#if !defined(IMAGE_BL2) + /* Skip UART initialization if it is already enabled */ + ldr r3, [r0, #USART_CR1] + ands r3, r3, #USART_CR1_UE + bne 1f +#endif /* IMAGE_BL2 */ /* Check baud rate and uart clock for sanity */ cmp r1, #0 beq core_init_fail @@ -78,7 +83,7 @@ teack_loop: ldr r3, [r0, #USART_ISR] tst r3, #USART_ISR_TEACK beq teack_loop -#endif /* IMAGE_BL2 */ +1: mov r0, #1 bx lr core_init_fail: |