U-Boot provides a verified-boot feature based around FIT, but there is no standard way of implementing it for a board. At present the various required pieces must be built up separately, to produce a working implementation. In particular, there is no built-in support for selecting A/B boot or recovery mode.
This series introduces VPL, a verified program loader phase for U-Boot. Its purpose is to run the verified-boot process and decide which SPL binary should be run. It is critical that this decision happens before SPL runs, since SPL sets up SDRAM and we need to be able to update the SDRAM-init code in the field.
Adding VPL into the boot flow provides a standard way of implementing verified boot. This series includes the phase itself, some useful Kconfig options and a sandbox_vpl build for sandbox.
Changes in v6: - Fix the missing SPDX tag on test/204... - Add docs for sandbox_vpl build - Drop TPL_HASH_SUPPORT patch since we only have SPL_HASH now
Changes in v5: - Rebase this patch on mainline (for GPIO and MISC Kconfig renames)
Changes in v4: - Add new patch to correct bloblist Kconfig dependencies - Add new patch to avoid building avb in SPL - Update spl_phase_prefix() for VPL - Tidy up some of the Makefile rules - Add options for blk, core, misc and tpl also - Add VPL_SIZE_LIMIT - Add a sandbox_vpl build - Update cover letter
Changes in v3: - Move VPL Kconfig options to a separate patch - Add full build support for VPL - Add a VPL size check (Kconfig option in next patch)
Changes in v2: - Add some more VPL Kconfig options
Simon Glass (11): doc: Convert SPL documentation to ReST doc: Expand SPL docs to explain the phase and config test: Tidy up test building with SPL bloblist: Correct Kconfig dependencies avb: Don't build in SPL Makefile: Simplify devicetree rules for SPL/TPL Makefile: Tidy up the TPL build rules binman: Add VPL support Introduce Verifying Program Loader (VPL) vpl: Add Kconfig options for VPL sandbox: Add a build for VPL
Kconfig | 10 + Makefile | 30 ++- arch/sandbox/Kconfig | 8 + arch/sandbox/cpu/spl.c | 12 +- arch/sandbox/dts/sandbox.dtsi | 10 +- board/sandbox/MAINTAINERS | 7 + common/Kconfig | 71 +++++- common/Makefile | 2 +- common/spl/Kconfig | 217 +++++++++++++++++- common/spl/spl.c | 25 ++- configs/sandbox_vpl_defconfig | 249 +++++++++++++++++++++ doc/arch/sandbox.rst | 13 ++ doc/develop/index.rst | 1 + doc/{README.SPL => develop/spl.rst} | 75 +++++-- drivers/Makefile | 2 + drivers/block/Kconfig | 12 + drivers/clk/Kconfig | 10 + drivers/core/Kconfig | 33 +++ drivers/core/Makefile | 2 +- drivers/gpio/Kconfig | 11 + drivers/i2c/Kconfig | 11 + drivers/misc/Kconfig | 28 +++ drivers/pinctrl/Kconfig | 18 +- drivers/rtc/Kconfig | 9 + drivers/serial/Kconfig | 20 ++ drivers/sysreset/Kconfig | 10 + drivers/timer/Kconfig | 10 + drivers/tpm/Kconfig | 30 +++ dts/Kconfig | 9 + include/bootstage.h | 2 + include/linux/kconfig.h | 3 + include/spl.h | 22 +- lib/Kconfig | 64 +++++- scripts/Kbuild.include | 4 + scripts/Makefile.autoconf | 12 + scripts/Makefile.build | 4 + scripts/Makefile.lib | 5 + scripts/Makefile.spl | 37 ++- tools/binman/etype/u_boot_vpl.py | 42 ++++ tools/binman/etype/u_boot_vpl_bss_pad.py | 44 ++++ tools/binman/etype/u_boot_vpl_dtb.py | 28 +++ tools/binman/etype/u_boot_vpl_expanded.py | 45 ++++ tools/binman/etype/u_boot_vpl_nodtb.py | 42 ++++ tools/binman/ftest.py | 109 +++++++-- tools/binman/state.py | 3 +- tools/binman/test/082_fdt_update_all.dts | 2 + tools/binman/test/201_u_boot_vpl.dts | 11 + tools/binman/test/202_u_boot_vpl_nodtb.dts | 13 ++ tools/binman/test/203_fdt_incl_vpl.dts | 13 ++ tools/binman/test/204_vpl_bss_pad.dts | 19 ++ 50 files changed, 1391 insertions(+), 78 deletions(-) create mode 100644 configs/sandbox_vpl_defconfig rename doc/{README.SPL => develop/spl.rst} (69%) create mode 100644 tools/binman/etype/u_boot_vpl.py create mode 100644 tools/binman/etype/u_boot_vpl_bss_pad.py create mode 100644 tools/binman/etype/u_boot_vpl_dtb.py create mode 100644 tools/binman/etype/u_boot_vpl_expanded.py create mode 100644 tools/binman/etype/u_boot_vpl_nodtb.py create mode 100644 tools/binman/test/201_u_boot_vpl.dts create mode 100644 tools/binman/test/202_u_boot_vpl_nodtb.dts create mode 100644 tools/binman/test/203_fdt_incl_vpl.dts create mode 100644 tools/binman/test/204_vpl_bss_pad.dts