l4-hackers May 2023

l4-hackers@os.inf.tu-dresden.de

3 participants
2 discussions

L4Re: Allocating pinned memory and obtaining its physical address
by Paul Boddie 24 May '23

24 May '23

Hello, Sorry to be lazy and not dig too deeply into the documentation and code, but once upon a time it was possible to use the l4re_ma functions to allocate pinned memory. Then, one would use the dataspace protocol to obtain the physical address of the memory via the capability involved in memory allocation. This exercise would be sufficient to get into a position to initialise peripherals in a system-on-a-chip, setting registers with the physical memory addresses they would need for … [View More]

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L4Re: Boot module copying and the MIPS Creator CI20
by Paul Boddie 21 May '23

21 May '23

Hello, As part of reviewing my earlier efforts getting L4Re running on various MIPS- based devices, I have been trying to get the bootstrap module to start the kernel on the MIPS Creator CI20, and here I encounter a strange problem. The bootstrap code appears to copy the different modules in the payload around in memory, and for the kernel, it finds the different sections at 0x2f4000 in physical memory (accessed via 0x802f4000), copying them into locations relative to the indicated module … [View More]

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l4-hackers May 2023