diff options
Diffstat (limited to 'meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0034-Disable-uart-debug-interface.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0034-Disable-uart-debug-interface.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0034-Disable-uart-debug-interface.patch b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0034-Disable-uart-debug-interface.patch new file mode 100644 index 000000000..941dc7d0d --- /dev/null +++ b/meta-openbmc-mods/meta-ast2500/recipes-bsp/u-boot/files/0034-Disable-uart-debug-interface.patch @@ -0,0 +1,54 @@ +From 961561c437c8a3f3de1753c502a20c334966354e 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 1/2] 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 8a596ceafc..8333ba1c59 100644 +--- a/arch/arm/include/asm/arch-aspeed/regs-scu.h ++++ b/arch/arm/include/asm/arch-aspeed/regs-scu.h +@@ -467,6 +467,7 @@ + #define SCU_MISC_VUART_TO_CTRL (0x1 << 13) + #define SCU_MISC_DIV13_EN (0x1 << 12) + #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 324387a4bc..c58fd3591b 100644 +--- a/board/aspeed/ast-g5/ast-g5-intel.c ++++ b/board/aspeed/ast-g5/ast-g5-intel.c +@@ -578,6 +578,10 @@ 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)); +-- +2.17.1 + |