On 23/11/2022 17:50, Paul Barker wrote: > These patches add support for the UEFI SPI I/O protocol defined in the > UEFI Platform Initialization (PI) Specification, Version 1.7 Errata A > (April 2020). This allows a UEFI application to interact with devices > on the SPI bus. > > This support is initially intended to be used to communicate with SPI > devices from "pre-boot" UEFI applications which perform setup before > the main OS is loaded. Other use cases may also be supported, however > this is not intended to be a replacement for UEFI capsule updates. > > The "pre-boot" UEFI application which we are currently developing will > interact with a Micron Authenta[1] flash device, sending vendor-specific > commands over the SPI bus to make use of Authenta security features, to > verify flash integrity and to generate ephemeral keys based on the flash > contents. > > The code here is self-contained and easy to enable/disable at compile > time. Compilation testing with am335x_evm_defconfig shows that the size > of u-boot.img increases by less than 2kB when CONFIG_EFI_SPI_PROTOCOL > is enabled. > > [1]: > https://www.micron.com/-/media/client/global/documents/products/product-flyer/authenta_technology_solutions_brief.pdf > > Changes since v4: > > * Dropped patches which have already been merged. > > * Re-based on top of my other patch series [2] to avoid conflicts in > am335x-sancloud-bbe-lite-u-boot.dtsi. > > * Dropped `am335x_evm_defconfig: Enable Micron SPI flash support` as > this was moved to my other patch series [3]. > > * Reformat code to fit in 80 chars per line where possible. > > * Use efi_install_multiple_protocol_interfaces() instead of > efi_create_handle() & efi_add_protocol(). > > * Rename dtb properties to start with 'u-boot,'. > > * Move SanCloud BBE Lite dtb changes to > am335x-sancloud-bbe-lite-u-boot.dtsi. > > * Convert remaining printf() calls to debug() calls. > > [2]: > https://lore.kernel.org/u-boot/20221114124243.3719037-1-paul.bar...@sancloud.com/ > [3]: > https://lore.kernel.org/u-boot/20221114124243.3719037-7-paul.bar...@sancloud.com/ > > Changes since v3: > > * Add implementation of spi_set_speed() so we can use this in > efi_spi_io_transaction(). > > * Rename convert_efi_string() to efi_convert_string() and move to > efi_string.c as a common helper function. > > * Call spi_set_speed() instead of manually de-referencing the function > pointer in struct dm_spi_ops. > > * Don't call efi_delete_handle() in destroy_efi_spi_peripheral(). > > * Use '%pUl' to print guid string. > > * Split efi_selftest changes into a separate patch. > > Changes since v2: > > * Added description to efi_spi_protocol.h. > > * Moved definition of EFI_SPI_CONFIGURATION_GUID to efi_api.h and > added it to the list in lib/uuid.c. > > * Fixed UEFI GUID byte order in test.dts and in debug output. > > * Use log_debug() instead of printf() for debug output. > > * Add test cases to confirm that efi_legacy_spi_controller_protocol > functions return EFI_UNSUPPORTED (as they are not currently > implemented) > > Changes since v1: > > * Skip emulated SPI peripherals. These appear as duplicates within the > list of devices on the bus when using the sandbox SPI drivers. > > * Make most printf statements debug only. > > * Add efi_seltest unit test. > > * Do not enable config EFI_SPI_PROTOCOL by default. > > * Mark functions with EFIAPI where necessary. > > * Handle debug_transaction argument to efi_spi_io_transaction(). > > * Handle a value of zero for target->max_read_size & > target->max_write_size. > > * Probe inactive SPI devices when initializing the EFI SPI protocol to > ensure that dev_get_parent_priv() returns valid data and the exported > devices are ready to use. > > Paul Barker (3): > efi_loader: Add SPI I/O protocol support > efi_selftest: Add tests for SPI protocol support > arm: dts: am335x-sancloud-bbe-lite: UEFI SPI export > > MAINTAINERS | 7 + > .../dts/am335x-sancloud-bbe-lite-u-boot.dtsi | 13 +- > arch/arm/dts/am335x-sancloud-bbe-lite.dts | 2 +- > arch/sandbox/dts/test.dts | 13 + > configs/am335x_evm_defconfig | 1 + > include/efi_api.h | 4 + > include/efi_loader.h | 4 + > include/efi_spi_protocol.h | 166 +++++ > lib/efi_loader/Kconfig | 8 + > lib/efi_loader/Makefile | 1 + > lib/efi_loader/efi_setup.c | 6 + > lib/efi_loader/efi_spi_protocol.c | 576 ++++++++++++++++++ > lib/efi_selftest/Makefile | 1 + > lib/efi_selftest/efi_selftest_spi_protocol.c | 284 +++++++++ > lib/uuid.c | 4 + > 15 files changed, 1086 insertions(+), 4 deletions(-) > create mode 100644 include/efi_spi_protocol.h > create mode 100644 lib/efi_loader/efi_spi_protocol.c > create mode 100644 lib/efi_selftest/efi_selftest_spi_protocol.c >
Sending a gentle ping on this series... is there any further feedback? Are there any outstanding issues to resolve? Thanks, -- Paul Barker Principal Software Engineer SanCloud Ltd e: paul.bar...@sancloud.com w: https://sancloud.com/
