Hello,

I just have a small question because I found the documentation about booting the Sel4 on RISC-V systems a bit confusing and not answering my questions.

1) I have ported all necessary code and I have successful compiled the `sel4test`. 2) I have flashed a SPL and U-Boot to 'mmc' which was built including OpenSBI fw_dynamic.bin but against most recent version (Sel4 was also compiled against most recent version OpenSBI v1.2 U-Boot SPL 2022.10-38338-g528ae9bc6c-dirty (Jan 11 2023 - 01:07:54 +0100)). 3) SPL and U-boot runs perfectly. 4) Sel4 does not want to boot. Why?

So, in the DTS which I extracted from SDK it is said: ` /memreserve/ 0x40000000 0x200000; /* opensbi */

/memreserve/ 0x42000000 0x100000; /* dsp used 1MB */

memory@40000000 { device_type = "memory"; reg = <0x0 0x40000000 0x0 0x8000000>; }; ` For the elfloader objdump reports the `_start at 0x40a21000` so I hardcoded it into the following

#define CONFIG_BOOTCOMMAND \ "if mmc rescan; then " \ "echo SD/MMC found on device ${mmc_dev};" \ "fatload mmc 0 0x40a21000 elfloader;" \ "fatload mmc 0 0x40a27940 archive.archive.o.cpio;" \ "bootelf 0x40a21000;" \ "fi;" \

And it reported an error: "Unhandled exception: Load access fault EPC: 000000007ffbd308 RA: 000000007ffbd33a TVAL: 00000005c66db5aa EPC: 0000000042e50308 RA: 0000000042e5033a reloc adjusted

Code: 69a2 6145 8082 7480 1793 0069 9426 943e (641c)

resetting ..." It seems that it relocates itself to 42e5033a (or not?) what actually I was trying to do manually.

U-boot reports (for the domain0) the next address which is 0x0000000042e00000. And when I am loading elfloader there, it exists back to uboot shell without any errors and nothing happens.

I can not understand what I am doing wrong, because FreeBSD and Linux starts normally. The #define seL4_UserTop is generated from DTS file if I understood correctly. But it seems it is incorrect.

I will be happy for any hint. Thank you.