ChanServ changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard & Bifrost - Logs https://oftc.irclog.whitequark.org/panfrost - <macc24> i have been here before it was popular
<icecream95>
I'm too impatient to wait for Mesa on compile on my Midgard chromebook, but sending BOs over the network from another board seems to work well enough
<icecream95>
I wonder how playable Neverball is
<icecream95>
About 2 fps, better than I expected!
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<jenneron[m]>
icecream95: rk3288 or exynos?
<icecream95>
jenneron[m]: RK3288
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<icecream95>
Uh oh, kbase seems to be causing kernel memory corruption again
<icecream95>
I'm trying to reverse the clear colour CRCs used for v9 and v10, which requires running a test program a bunch of times to collect data
<icecream95>
I started getting "-bash: fork: Cannot allocate memory" after 360 iterations, but it's not like I need more than four or five
<icecream95>
I'll start with v9, the v10 CRC is either shorter or truncated
<icecream95>
Oops, and now I realise that I got collection wrong... I only want power of two values
<icecream95>
So then I only have eight to work with
<icecream95>
The polynomial appears to be 0x4e5a04000852140a then?
<icecream95>
This could probably be derived from the main polynomial of 0xc96c5795d7870f42, but I can't be bothered checking
<icecream95>
For v10, the polynomial is 0x4000000000008000 ???
<icecream95>
That seems an odd choice
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<icecream95>
(I'm mixing polynomial formats. Maybe I should instead write 0x8000000000010000?
<icecream95>
Or rather 0x800000000003, which does appare to be a used polynomial
<icecream95>
I wonder why they moved down from a 64-bit to 48-bit CRC, surely it should be collisions happen far more often?
<icecream95>
"It is often a poor choice if you care about anything better than HD=4, but is a reasonable baseline for comparison with other polynomials"
<icecream95>
But in this case CRCs are used for detecting differences rather than checking for errors, so that isn't relevant?
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<icecream95>
I guess the main win is that it is easier to compute than the 64-bit "XZ" polynomial for v5-v7?
<icecream95>
* v5-v9
<icecream95>
Now to see if a input or output XOR is used
<icecream95>
Actually I think that I do need to collect more data...
<icecream95>
Uh... is the v9 polynomial actually 0x8000000000000001?
<icecream95>
So then both v9 and v10 have new polynomials. Does actual framebuffer data use the same polynomial, or only the clear colour?
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