From 82239aa7cd6bca3fbb2335523e4f8ff782c401c8 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 7 Apr 2018 16:16:30 +0200 Subject: [PATCH] ARM: rmobile: Add JTAG recovery support for M2 Porter Add JTAG recovery support into the M2 Porter TPL. This allows the TPL to be loaded over JTAG, initialize the system, wait for the JTAG debugger to load U-Boot image into RAM and then resume and start U-Boot from RAM. The procedure is as follows: 1) Load u-boot-tpl.bin to 0xe6300000 2) Write magic number 0x1337c0de to 0xe6300020 TPL checks for this particular magic and starts JTAG recovery if this number is present. This is not present by default. 3) Start U-Boot TPL from 0xe6300000 4) Wait for a message from TPL on UART indicating JTAG boot: "JTAG boot detected!" 5) Halt the system in JTAG debugger 6) Load U-Boot image (u-boot.img) to 0x4fffffc0 7) Write magic number 0xb33fc0de to 0xe6300024 TPL checks for this particular magic to verify that the U-Boot image was loaded into DRAM by the JTAG debugger. 8) Resume the system in JTAG debugger Signed-off-by: Marek Vasut Cc: Nobuhiro Iwamatsu --- arch/arm/mach-rmobile/include/mach/boot0.h | 24 ++++++++++++++++++++++++ board/renesas/porter/porter_spl.c | 21 +++++++++++++++++++++ configs/porter_defconfig | 3 +++ 3 files changed, 48 insertions(+) create mode 100644 arch/arm/mach-rmobile/include/mach/boot0.h diff --git a/arch/arm/mach-rmobile/include/mach/boot0.h b/arch/arm/mach-rmobile/include/mach/boot0.h new file mode 100644 index 0000000..3edd461 --- /dev/null +++ b/arch/arm/mach-rmobile/include/mach/boot0.h @@ -0,0 +1,24 @@ +/* + * Specialty padding for the RCar Gen2 TPL JTAG loading + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef __BOOT0_H +#define __BOOT0_H + +_start: + ARM_VECTORS + +#ifdef CONFIG_TPL_BUILD + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; + .word 0x0badc0d3; +#endif + +#endif /* __BOOT0_H */ diff --git a/board/renesas/porter/porter_spl.c b/board/renesas/porter/porter_spl.c index 533b0b4..f711aa9 100644 --- a/board/renesas/porter/porter_spl.c +++ b/board/renesas/porter/porter_spl.c @@ -463,6 +463,27 @@ void spl_board_init(void) void board_boot_order(u32 *spl_boot_list) { +#ifdef CONFIG_TPL_BUILD + const u32 jtag_magic = 0x1337c0de; + const u32 load_magic = 0xb33fc0de; + + /* + * If JTAG probe sets special word at 0xe6300020, then it must + * put U-Boot into RAM and TPL will start it from RAM. + */ + if (readl(CONFIG_TPL_TEXT_BASE + 0x20) == jtag_magic) { + printf("JTAG boot detected!\n"); + + while (readl(CONFIG_TPL_TEXT_BASE + 0x24) != load_magic) + ; + + spl_boot_list[0] = BOOT_DEVICE_RAM; + spl_boot_list[1] = BOOT_DEVICE_NONE; + + return; + } +#endif + /* Boot from SPI NOR with YMODEM UART fallback. */ spl_boot_list[0] = BOOT_DEVICE_SPI; spl_boot_list[1] = BOOT_DEVICE_UART; diff --git a/configs/porter_defconfig b/configs/porter_defconfig index a0e44df..e4a2828 100644 --- a/configs/porter_defconfig +++ b/configs/porter_defconfig @@ -1,4 +1,5 @@ CONFIG_ARM=y +CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK=y CONFIG_ARCH_RMOBILE=y CONFIG_SYS_TEXT_BASE=0x50000000 CONFIG_SPL_GPIO_SUPPORT=y @@ -29,6 +30,8 @@ CONFIG_SPL_YMODEM_SUPPORT=y CONFIG_TPL=y CONFIG_TPL_BOARD_INIT=y CONFIG_TPL_NEEDS_SEPARATE_TEXT_BASE=y +CONFIG_TPL_RAM_SUPPORT=y +CONFIG_TPL_RAM_DEVICE=y CONFIG_TPL_SERIAL_SUPPORT=y CONFIG_TPL_SPI_FLASH_SUPPORT=y CONFIG_TPL_SPI_LOAD=y -- 2.7.4