
Hi, I am porting SEL4 on RISCV FPGA. I am stuck midway in the kernel elf loader. The function stuck is memcpy. I have added prints and I am not progressing after the last memcpy call in unpack_elf_to_paddr(). All kinds of input appreciated. Function under review: *static void unpack_elf_to_paddr(void *elf, paddr_t dest_paddr)* /* Parse size/length headers. */ dest_vaddr = elf_getProgramHeaderVaddr(elf, i); data_size = elf_getProgramHeaderFileSize(elf, i); data_offset = elf_getProgramHeaderOffset(elf, i); /* Load data into memory. */ * memcpy((char *)dest_vaddr + phys_virt_offset,* * (char *)elf + data_offset, data_size);* * printf("loaded data into memory \n"); -----> Stuck Here !* } } *Can anyone give me a clue on whatsoever to check here ? **It worked perfectly in spike simulation.* *RISCV FPGA configuration* - It supports IMAFD. It has already booted linux. Kernel is loaded at physical address 80 million. -- regards, Sathya

Hi Sathya,
I'm familiar with the use of the elfloader on ARM platforms, but not so familiar with the RISC-V port.
My bet is that the memcpy is overwriting some part of the elfloader code, data or stack sections.
To resolve this, you could try to load/execute the elfloader from a higher address in memory.
Alternatively, the destination address range for the memcpy may not be to RAM. It might help to draw a diagram of where RAM lies, where the elfloader lies, and where the kernel and user images will be copied to.
- Alex
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From: Devel
participants (2)
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Alexander.Kroh@data61.csiro.au
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Sathya Narayanan N