ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<prabhakarlad>
Hi all, I am trying to disable the caches on arm64 platform for Linux. To do so I clear SCTLR_ELx_C but after doing that I see kernel freeze. any pointers on to having linux booted with caches disabled?
<prabhakarlad>
Forty-Bot: to test the memory controller without caches enabled.
<Forty-Bot>
if you don't need to stress it that much you can try doing it in U-Boot
<Forty-Bot>
or maybe with dma?
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<prabhakarlad>
Forty-Bot, I want to specifically do it in Linux due to the performance tool.
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<robmur01>
often the interconnect and/or memory controller don't actually support stuff like exclusives and atomics, so not being able to resolve those within the CPU cache can lead to blowing up on an external abort
<robmur01>
if you just want to hammer on a non-cacheable mapping of DRAM, that should be easy enough to set up from a custom module, or even just use /dev/mem
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<HdkR>
Does a getcpu vdso implementation for aarch64 have any movement yet? I haven't been watching too closely
<broonie>
Not seen anything on the list. I did something ages ago but abandoned it when vincenzo said he was going to do something else at LPC then didn't follow through.
<broonie>
Someone was asking recently though.
<HdkR>
I see
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<prabhakarlad>
robmur01: can you please share more details on setting up non-cached region using /dev/mem. any pointer would be helpful.