sorear changed the topic of #riscv to: RISC-V instruction set architecture | https://riscv.org | Logs: https://libera.irclog.whitequark.org/riscv
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<cousteau> Hi
<cousteau> Does `jal x0, -4` mean "jump to the previous instruction", or "jump to this instruction because the pc has already moved forward 4 bytes, so you're rewinding it 4 bytes so that it points here again"?
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<dramforever_> cousteau: previous instruction, assuming no stuff like compressed instructions
<dramforever_> pc is always 'current instruction' for the purposes of pc relative stuffs
<dramforever_> (i assumed you meant -4 as the actual immediate value. note that if you just do `jal x0, -4` in e.g. gnu as, it might mean 'jump to absolute address -4')
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<cousteau> dramforever_: thanks!
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<cousteau> Yeah I was assuming 4-byte instructions here...
<cousteau> dramforever_: oh, my bad
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<cousteau> The instruction was 0xFFDFF06FF (opcode = 11011_11 (JAL), rd = 00000 (x0), immediate value = a bit salad that translates to -4)
<cousteau> Perfect, thanks!
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<ikke> Anyone knows what the temperature limits are of the starfive / jh7100? The fan is kind of anoying
<Esmil> ikke: don't take this as advice, but as a datapoint my vf1 has been running without a fan for months and is right now at 66C
<ikke> ok, interesting
<mps> my two olimex A64 boards are normally at this temp
<mps> and one lamobo R1 runs more than five years at 48-53 celsius range
<conchuod> I took the fan of my v5 right away, seemed overkill to me
<mps> I'm thinking to by passive one and put in VF1 with good paste
<ikke> How do you mount it/
<mps> use termal paste as glue
<ikke> ah
<ikke> conchuod: what's the temporature of your v5?
<conchuod> Dunno, let me turn it on for a bit
<conchuod> I just removed the fan though, not the heatsink
<ikke> I still have it on there, just disconnected the cable
<mps> it is not advice but I think heatsink which comes with VF1 and glued with good thermal paste is fine
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<conchuod> ikke: after 15 minutes, the heatsink is at 45 degrees
<ikke> mine is at 47.8 now
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<ikke> Seems to remain stable around that temperature now
<conchuod> Yeah, mines at about that too
<conchuod> room temp is ~25
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