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From aec56ef4f3cf0417a28ddc0719603d54073eee09 Mon Sep 17 00:00:00 2001
From: Yong Li <yong.b.li@linux.intel.com>
Date: Tue, 20 Aug 2019 16:10:03 +0800
Subject: [PATCH] Disable uart debug interface
AST2500 SOC integrates a UART debug interface which can
input commands to AST2500 by using simple terminal
program without the assistance of CPU.
For security requirements, we need to disable this feature,
set SCU2C[]10 = 1 to disable it.
Tested:
Flash the u-boot.bin and dump SCU2C as below:
md 0x1e6e202c
1e6e202c: 00200400
Signed-off-by: Yong Li <yong.b.li@linux.intel.com>
Signed-off-by: Vikram Bodireddy <vikram.bodireddy@intel.com>
---
arch/arm/include/asm/arch-aspeed/regs-scu.h | 1 +
board/aspeed/ast-g5/ast-g5-intel.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/arch/arm/include/asm/arch-aspeed/regs-scu.h b/arch/arm/include/asm/arch-aspeed/regs-scu.h
index a2c9549fc6..1bdb1d8574 100644
--- a/arch/arm/include/asm/arch-aspeed/regs-scu.h
+++ b/arch/arm/include/asm/arch-aspeed/regs-scu.h
@@ -468,6 +468,7 @@
#define SCU_MISC_DIV13_EN (0x1 << 12)
#define SCU_MISC_DEBUG_UART (0x1 << 10)
#define SCU_MISC_Y_CLK_INVERT (0x1 << 11)
+#define SCU_MISC_UART_DEBUG_DIS (0x1 << 10)
#define SCU_MISC_OUT_DELAY (0x1 << 9)
#define SCU_MISC_PCI_TO_AHB_DIS (0x1 << 8)
#define SCU_MISC_2D_CRT_EN (0x1 << 7)
diff --git a/board/aspeed/ast-g5/ast-g5-intel.c b/board/aspeed/ast-g5/ast-g5-intel.c
index 12216922ac..e05a6da468 100644
--- a/board/aspeed/ast-g5/ast-g5-intel.c
+++ b/board/aspeed/ast-g5/ast-g5-intel.c
@@ -589,6 +589,10 @@ extern void espi_init(void);
extern void kcs_init(void);
void ast_g5_intel(void)
{
+ /* Disable uart port debug function */
+ ast_scu_write(ast_scu_read(AST_SCU_MISC1_CTRL) |
+ SCU_MISC_UART_DEBUG_DIS, AST_SCU_MISC1_CTRL);
+
uart_init();
pwm_init();
gpio_init(gpio_table, ARRAY_SIZE(gpio_table));
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