Hello,
We are enabling secure boot on Zynqmp with SPL.
The issue however is that during secure boot, the bootrom not only validates the first loader (SPL and PMUFW combo) but it will also expect a signed bitstream during load(FPGA).
Since currently the SPL load of an FPGA image from FIT does not support loading images for authentication (fpga_loads), I'd like to discuss how to best implement such support.
A pretty standard file.its description of the FPGA loadable looks like this:
fpga { description = "FPGA binary"; data = /incbin/("${DEPLOY_DIR_IMAGE}/${SPL_FPGA_BINARY}"); type = "fpga"; arch = "${UBOOT_ARCH}"; compression = "none"; load = <${fpgaloadaddr}>; hash-1 { algo = "${FIT_HASH_ALG}"; }; };
We could extend imagetool.h struct image_tool_params to add more params or perhpas just define different 'types' of fpga?
Something like: "fpga" "fpga-auth" : authenticated "fpga-enc" : encrypted "fpga-sec" : encrypted and authenticated
Then it would be a matter of modifying https://github.com/u-boot/u-boot/blob/master/common/spl/spl_fit.c#L572
any thoughts?
TIA Jorge