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08:40
<
Sofia >
Not quite complete. Needs more to run apk. Haven't dived deep enough to fix that.
08:41
<
Sofia >
It is 7.6 MiB with a broken apk, or 5.2 MiB with just busybox (and qemu-riscv64)
08:43
<
Sofia >
Bah. My editor ate the \x.
08:50
<
Sofia >
Disabled the APK part because broken.
08:53
<
Sofia >
Of course read the script and run it in its own directory. :)
08:59
<
Sofia >
I'd call it complete with just apk working because then you can install gcc et al.
09:00
<
Sofia >
Probably other core packages necessary, but once apk works you can get them.
09:00
<
Sofia >
I'm done with this for now. Might revisit in the future.
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<
Sofia >
Not done for now I guess. But... that minirootfs seems to also not have a working apk out of the box.
09:25
<
Sofia >
It is smaller than I expected. 2.3 MiB compressed. 5.6 MiB extracted.
09:29
<
Sofia >
The issue seems to be networking.
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<
Sofia >
(Yes.. I overengineered a script to download and extract two archives. And do a little tweaking.)
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22:12
<
la_mettrie >
what might be a good assembly project with Longan Nano in order to learn about the system programming...
22:22
<
kehvo >
Perhaps interfacing with an external IC, like a retro soundchip, and building something around that and the display? Add some buttons, and you've got, for example, a self-made physical fantasy console :)
22:23
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22:27
<
la_mettrie >
hm, that sounds rather a kind of application level stuff? but it would teach something about system issues as well?
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22:31
<
sorear >
what are you considering systems?
22:32
<
sorear >
any idea if it has PMP?
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22:47
<
kehvo >
la_mettrie: dealing with timers, interrupts and external input (be it sound or just buttons, for example, but why not something else too)
22:48
<
kehvo >
There arent many peripherals in the device to do complex things I think
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22:49
<
la_mettrie >
okay, sounds promising
22:50
<
la_mettrie >
hm, string "mtimecmp" isn't found from linux kernel. so they do interrupts in some other way
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22:59
<
Finde >
doesn't the m in mtimecmp mean machine mode?
22:59
<
Finde >
thus it wouldn't be in the kernel?
23:00
<
Finde >
it'd be accessed from sbi instead
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23:01
<
jrtc27 >
mtimecmp is, sadly, not a real csr, for $reasons it was turned into a memory-mapped register left up to the platform
23:01
<
jrtc27 >
M-mode linux calls it clint_timer_cmp
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23:01
<
jrtc27 >
for S-mode linux/freebsd timer interrupts are scheduled as finde says by sbi calls, where firmware will poke the memory-mapped intended-for-m-mode mtimecmp
23:02
<
jrtc27 >
though at the end of last year the Sstc (Supervisor extension S-mode time compare) extension got ratified
23:02
<
jrtc27 >
which adds an stimecmp
23:02
<
jrtc27 >
and is an actual CSR
23:03
<
jrtc27 >
(see sbi_set_timer in linux and freebsd)
23:04
<
jrtc27 >
(called that because that's what the SBI spec calls it)
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