Questions on RISC-V OP-TEE solution

[aousherovitch-tt]

Hello,
we are looking to use your RISC-V OP-TEE solution for our hw (including the QEMU emulation).
I have some initial questions, if possible. Appreciate your time!

1. Where are you with regard to the upstreaming of all the changes?
   I see that Introduce OpTEE complete solution for RISC-V and looking for how to contribute it OP-TEE/optee_os#6173 is closed. Are there any other open issues meant for upstreaming? (including for QEMU)
2. is there a place where we can see outstanding issues / TODO’s?
3. Are there changes in op-tee, opensbi etc. that were made specific to Nuclei board/platform that are not inside the following:

./conf/evalsoc/*
./conf/demosoc/*
./u-boot/include/configs/nuclei-*.h
./u-boot/configs/nuclei_*
./u-boot/board/nuclei/*
./u-boot/drivers/gpio/nuclei_gpio.c
./u-boot/drivers/spi/nuclei_spi.c
./u-boot/drivers/serial/serial_nuclei.c
./u-boot/arch/riscv/dts/nuclei-demosoc.dts
./buildroot/dl/toolchain-external-custom/nuclei_riscv_glibc_prebuilt_linux64_2022.04.tar.bz2
./opensbi/platform/nuclei/*
./opensbi/include/sbi_utils/serial/nuclei-uart.h
./opensbi/lib/utils/serial/nuclei-uart.c
./opensbi/lib/utils/serial/fdt_serial_nuclei.c
./opensbi/docs/platform/nuclei_ux600.md
./linux/drivers/gpio/gpio-nuclei.c
./linux/drivers/irqchip/irq-nuclei-plic.c
./linux/drivers/spi/spi-nuclei.c
./linux/drivers/net/ethernet/nuclei
./linux/drivers/tty/serial/nuclei_uart.c
./optee/optee_os/core/pta/nuclei/*
./optee/optee_os/core/arch/riscv/plat-nuclei/*

4. Is there a place where all of the Nuclei custom registers/extensions are documented?
5. Any insight into the choice of optee config options in nuclei-linux-sdk/optee/optee_os/core/arch/riscv/plat-nuclei/conf.mk or other config options - e.g. were there any that were disabled as a workaround for some issues?
6. Details on nuclei_riscv_glibc_prebuilt_linux64_2022.04.tar.bz2 - repo/version where the sources were taken from, build instructions?
   Thank you!

[fanghuaqi]

1. The upstream is not yet started by us, still in our code base, for qemu, you can refer to https://github.com/riscv-mcu/qemu/tree/nuclei/8.0
2. riscv smp interrupt context problem OP-TEE/optee_os#6075 is still hanging up
3. Most of the changes related to board or soc related, the required plic change mentioned here https://github.com/Nuclei-Software/nuclei-linux-sdk/blob/feature/optee_5.10/optee/README_en.md, other changes are not related to OpTEE, just some Nuclei internal CSR feature, not affecting any OpTEE features
4. No official open document, we have an open one here, but out of date, latest version may need NDA https://doc.nucleisys.com/nuclei_spec
5. see 1
6. see https://github.com/riscv-mcu/riscv-gnu-toolchain/tree/nuclei-multilib, not too much changes in toolchain, even build root toolchain is enough