<solrize>
be working with 64-bit integer types whenever possible on these machines. interesting post about compilers using int overflow UB to optimize 32 bit loop indices on 64 bit machines
<solrize>
wonder what riscv code would look like with and without the optimization
<rjek>
Review of the Unmatched board so far: The packaging, documentation, hardware is nice. Build quality is excellent. I would have preferred they fitted a RTC battery in the holder than ship a shielded patch lead. The SoC is surprisingly glacial.
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<GreaseMonkey>
the main thing i'd like to see different from a mechanical perspective is a better fan
<GreaseMonkey>
i've had success with displacing the fan on my case, aiming it in the direction of the board, and cable-tying it to the top of the case mesh
<rjek>
Yeah the fan is terrible
<rjek>
Means I can't put it in a 1U case either
<rjek>
But I can barely hear it over the office AC :D
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<leah2>
i'm trying to add another entry to the extlinux.conf of freedom-sdk on unmatched, but even with timeout it seems to always immediately go for the first menu entry
<rjek>
Yep
<rjek>
I have had exactly that problem, I don't think U-Boot has any support for extlinux menus
<leah2>
according to their wiki it has, but maybe it's not in
<rjek>
You can never tell precisely which features any given vendor has decided to build into the U-Boot they ship with your board, without source, and without build instructions
<rjek>
Oh that's a point, I recall no written offer of source in the box
<leah2>
so how so i override root= for one boot, hm
<jrtc27>
just put grub-efi on the damn thing like they should've done in the first place
<jrtc27>
extlinux should not be used on riscv, it should never have been supported
<jrtc27>
it just perpetuates the old pre-efi arm boot crap
<rjek>
Or just boot direct from U-Boot using its native stuff
* rjek
hates it when people say they are "PXE booting" an ARM board or whatnot because they have a pxelinux.conf file
<jrtc27>
no, u-boot native crap is what needs to die
<jrtc27>
it only exists because u-boot didn't do efi
<jrtc27>
never give people more than one way of booting a machine
<jrtc27>
we have efi now, as sucky as it is it is an industry standard and is what everyone should be defaulting to
<jrtc27>
maybe the world would be a better place if OF had won, but industry abandoned it outside of PowerPC and SPARC
<rjek>
leah2: Yep that's what I've done too
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<davidlt>
leah2, multiple entries should work, not a general user of it but it worked multiple times over multiple years before
<davidlt>
U-Boot is compiled with EFI by default on RISC-V
<leah2>
i dont see any prompt
<davidlt>
The kernel now supports EFI too
<leah2>
perhaps i need "prompt 1"..
<davidlt>
GRUB can be compile with EFI support, but currently only GRUB legacy boot mode is supported
<davidlt>
There is ongoing review for LoadFile2 to be enabled for RISC-V which finished the chain U-Boot -> GRUB2 -> Kernel in EFI
<jrtc27>
linux will catch up with freebsd eventually :P
<davidlt>
There is also TianoCore UEFI firmware for Unleashed
<davidlt>
It's not in the best shape IIRC, but it works
<jrtc27>
yeah no I'm not using that pile of crap yet, I've seen the patches
<jrtc27>
I mean, aside from the fact it's the mess that is EDK2 in the first place
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<jrtc27>
it was only a month or so ago that the devs were still trying to make EDK2 run in M-mode not S-mode
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<jimwilson_>
rjek, github.com/sifive/freedom-u-sdk, ships with the 2021.03.1 release, this is docs for our Open Embedded layer at meta-sifive, sources available there, should be mentioned in one of the docs, mentioned in the SW Reference Manual at least
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<jrtc27>
some of us don't want to deal with the mess that is bitbake :)
* jrtc27
just wants a u-boot.git that can be cloned and built
<jrtc27>
(or has everything been upstreamed now?)
<vagrantc>
enough has been upstreamed to load u-boot, but i wasn't able to successfully boot a linux kernel with it on the unmatched
<jimwilson_>
I don't follow u-boot, but I think the 2021.01 u-boot patches are all upstream, and now we need a new set of patches for 2021.07 u-boot which we haven't done yet
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<GreaseMonkey>
huh, looking at the patches i probably don't have the 1.2 GHz patch set up
<xentrac>
jrtc27: it sounds like you hate efi a lot less than I do
<GreaseMonkey>
...on second thoughts i'll need to look at the dtb
<xentrac>
I think the IEEE 1275 OF standard has actually been withdrawn now
<geist>
hmm, when you said uboot is compiled with EFI, does that mean uboot pretends to be a UEFI complaint environment, or that it can be loaded as a UEFI app
<geist>
i assume the latter?
<geist>
my experience with uboot goes way back, but alawys on ARM and always as a fairly bespoke native uboot boot thing
<jrtc27>
the former
<jrtc27>
it's been that for years
<jrtc27>
provides efi boot services
<jrtc27>
it's not that it pretends, it literally is