My goal when I started on this project a year ago was to get to linux userspace within a second from power on. Oh, and it had to be secure! Contrast that to the two minutes it took the STLinux demo to come up.
It was obvious that the accepted way of running an FSBL, then SSBL was going to blow the time budget. There really wasn't a good solution, and traditional falcon mode with "spl export" command was not secure.
I chose to use SPL with a FIT payload. We have to add certain logic to SPL, as well as some FDT modifications that would be normally done in u-boot. The boot flow is
SPL -> OP-TEE -> Linux
One of the major complaints of v1 was that we shouldn't be patching the devicetree with optee nodes in SPL. Instead, we should let OP-TEE add the required nodes. I tried it, found a huge boot time penalty, and decided against it.
Another issue from v1 that I was unable to address is the MAC address. It was suggested to use the "nvmem-cells" FDT property to tell linux where in the OTP to read the MAC. Because of the way the linux BSEC driver is written, this would only work with TF-A, but fails with SPL.
There is also the issue of how to make the optee/ library available to SPL. Patrick has a couple of patches up regarding the issue, so I have not touched it in this series.
Changes since v1: - Move SYS_MMCSD_RAW_MODE_KERNEL_SECTOR to Kconfig instead of stm32mp1.h - Create a new defconfig for STM32MP in falcon mode - Rework board_fit_config_name_match() per Patrick's suggestions - Use "u-boot,falcon-gpios" instead of "st,fastboot-gpios" - Only update shadow registers in SPL for BSEC .probe()
Alexandru Gagniuc (11): spl: Move SYS_MMCSD_RAW_MODE_KERNEL_SECTOR to Kconfig stm32mp1: Add support for baudrates higher than 115200 stm32mp1: Add support for falcon mode boot from SD card board: stm32mp1: Implement board_fit_config_name_match() for SPL fdt_support: Implement fdt_ethernet_set_macaddr() arm: stm32mp: bsec: Update OTP shadow registers in SPL arm: stm32mp: Factor out reading MAC address from OTP stm32mp1: spl: Configure MAC address when booting OP-TEE lib: Makefile: Make optee library available in SPL ARM: dts: stm32mp: Add OP-TEE "/firmware" node to SPL dtb stm32mp1: spl: Copy optee nodes to target FDT for OP-TEE payloads
README | 4 - arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi | 3 + arch/arm/mach-stm32mp/bsec.c | 4 +- arch/arm/mach-stm32mp/cpu.c | 59 ++++-- .../arm/mach-stm32mp/include/mach/sys_proto.h | 3 + arch/arm/mach-stm32mp/spl.c | 3 + board/st/stm32mp1/spl.c | 53 +++++ common/fdt_support.c | 30 +++ common/spl/Kconfig | 11 ++ configs/am335x_boneblack_vboot_defconfig | 1 + configs/am335x_evm_defconfig | 1 + configs/am335x_igep003x_defconfig | 1 + configs/am335x_shc_defconfig | 1 + configs/am335x_shc_ict_defconfig | 1 + configs/am335x_shc_netboot_defconfig | 1 + configs/am335x_shc_sdboot_defconfig | 1 + configs/am335x_sl50_defconfig | 1 + configs/am3517_evm_defconfig | 1 + configs/am43xx_evm_defconfig | 1 + configs/am43xx_evm_rtconly_defconfig | 1 + configs/am43xx_evm_usbhost_boot_defconfig | 1 + configs/am57xx_evm_defconfig | 1 + configs/devkit8000_defconfig | 1 + configs/display5_defconfig | 1 + configs/display5_factory_defconfig | 1 + configs/dra7xx_evm_defconfig | 1 + configs/gwventana_emmc_defconfig | 1 + configs/gwventana_gw5904_defconfig | 1 + configs/gwventana_nand_defconfig | 1 + configs/igep00x0_defconfig | 1 + configs/imx6dl_mamoj_defconfig | 1 + configs/imx6q_logic_defconfig | 1 + configs/imx6qdl_icore_mipi_defconfig | 1 + configs/imx6qdl_icore_mmc_defconfig | 1 + configs/imx6qdl_icore_rqs_defconfig | 1 + configs/mccmon6_nor_defconfig | 1 + configs/omap35_logic_defconfig | 1 + configs/omap35_logic_somlv_defconfig | 1 + configs/omap3_logic_defconfig | 1 + configs/omap3_logic_somlv_defconfig | 1 + configs/omap4_panda_defconfig | 1 + configs/omap5_uevm_defconfig | 1 + configs/stm32mp15_falcon_defconfig | 181 ++++++++++++++++++ include/configs/brppt1.h | 1 - include/configs/devkit8000.h | 2 - include/configs/display5.h | 1 - include/configs/embestmx6boards.h | 1 - include/configs/gw_ventana.h | 1 - include/configs/imx6-engicam.h | 1 - include/configs/imx6_logic.h | 1 - include/configs/imx6dl-mamoj.h | 1 - include/configs/ls1043ardb.h | 1 - include/configs/mccmon6.h | 1 - include/configs/mx6sabreauto.h | 1 - include/configs/mx6sabresd.h | 1 - include/configs/pico-imx6.h | 1 - include/configs/pico-imx6ul.h | 1 - include/configs/pico-imx7d.h | 1 - include/configs/sama5d3_xplained.h | 1 - include/configs/stm32mp1.h | 4 + include/configs/tam3517-common.h | 1 - include/configs/ti_armv7_common.h | 1 - include/configs/vyasa-rk3288.h | 1 - include/configs/xea.h | 1 - include/configs/xilinx_zynqmp.h | 1 - include/configs/zynq-common.h | 1 - include/fdt_support.h | 17 ++ lib/Makefile | 2 +- scripts/config_whitelist.txt | 1 - 69 files changed, 386 insertions(+), 45 deletions(-) create mode 100644 configs/stm32mp15_falcon_defconfig