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22:11
<
lkcl_ >
daveshah: ah. i think i found the source of the problem - i haven't implemented the DEC and TB SPRS yet... :)
22:11
<
lkcl_ >
these are counters and, whoops, litex memtest relies on them...
22:12
<
daveshah >
Huh, I'm surprised that litex is that sophisticated tbh
22:14
<
lkcl_ >
ah - pythondata_cpu_microwatt.
22:15
<
lkcl_ >
which... provides a replacement that
*might* be being used, might not. hmmm
22:53
<
somlo >
lkcl_, daveshah: nothing helpful to add, but curious: I assume DEC and TB SPRS are cpu instructions, and the surprise is that whatever C code in the litex bios is compiled by gcc ends up actually using those instructions' opcodes?
22:55
<
sorear >
SPR= special purpose register, DEC=decrementer (timer interrupt)
22:58
<
somlo >
litex has its own timer IP core and it does use an IRQ line. No idea re. SPR :)
23:01
<
somlo >
and a lot of the generic code in the litex bios uses that timer to implement delay loops of various sorts
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