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<artemist>
The best part is that there's an ARMv8-A core that only runs A32 and T32: the Cortex-A32
<artemist>
Not that anyone seriously used it
<Yuzu>
and the A34, its 64b-only cousin
<artemist>
tbh i'm surprised that they're still putting A32 and T32 in the Cortex-A77
<artemist>
:q
<artemist>
oops
<opticron>
heh
<opticron>
the A77 is a mainstream/generic CPU directly from ARM, so it still makes sense
<opticron>
but, I figure they will start releasing high end A64-only at some point soon
<opticron>
I didn't know about the A34, that's neat
<Yuzu>
A32 is 32b only, A34 is 64b only, A35 is both. closely related cores other than that
<Yuzu>
ARM's dropping aarch32 support in the core after Matterhorn
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<puhitaku>
i've just purchased an M1 MBA just for experiments and i'd be glad to do disassembling and soldering if it's worth to try
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<davidrysk[m]>
puhitaku: you probably won't have to, if anything that special USB cable would be of use
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<puhitaku>
yeah basically i hope it works well in any aspect of analysis
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<puhitaku>
my concern is that special USB communication should be achieved on higher layers relatively. generally speaking USB communication is not available in the early stages of booting. I'm not sure neither how or if Apple provides it magically nor the entire boot sequence so I'm gonna learn them
<davidrysk[m]>
puhitaku: they use vendor USB-PD commands to expose UART, etc over USB. https://t8012.dev/ is a good place to start
<davidrysk[m]>
there was also a tweet by marcan but I forget where it was
<puhitaku>
never knew it's handled by T2! thanks a lot for the link
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<davidrysk[m]>
it's not handled by a T2, but it's basically done the same way since the M1 is more or less a much expanded T2
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<Fanfwe>
it's not handled by the T2, it's the USB mux controller (CD3217 from Texas Instruments) also known as ACE in Apple's own schematics
<Fanfwe>
Type-C has 2 "general purpose" pins that can carry whatever signal you like
<Fanfwe>
Apple has implemented a special vendor specific set of messages in the USB-PD protocol so you can request those two general purpose pins to be used as TX and RX lines of the machine's UART
<Fanfwe>
only thing is that logic level on those pins is not the usual 5V or 3.3V TTL
<Fanfwe>
so you need a level translation circuit
<Fanfwe>
But yeah, essentially, being able to get UART on the USB-C is totally independent from what runs on the T2 and/or M1.
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<puhitaku>
nice details, also thanks for that, now i understood the overview
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<marcan>
puhitaku: my first step will be a serial bootloader, and the second step will be adding usb-device support for that, and then I'll add earlyprintk support for that to linux (this will also be useful on the rPi, FWIW)
<marcan>
so if everything goes according to plan, nobody will *really* need a serial cable to help out with the kernel bringup
<marcan>
(other than me)
<marcan>
but I will be making an open hardware design for it anyway, it's a thing that's nice to have
<marcan>
I just think I can avoid it being a blocker for anyone
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<Bluerise>
aaand if there's a glass framebuffer, it's probably not really necesasry anyway
<Bluerise>
I mean, if we can get an early glass framebuffer, that's enough for most people
<marcan>
there is, in fact that will be my first hello world, because poking a pixel on the framebuffer is slightly less error prone than sending stuff out of serial
<marcan>
but the usb/serial thing is useful to get I/O
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<puhitaku>
those steps sound natural while taking control of LCDs must be a journey as we have to make so many parts clear like DMAs and LCD interfaces before getting a fb... even we ignore the GPU stack entirely for the first step
<puhitaku>
i'm a bit curious on how to find parts like DMAs in the vast memory map. from the source code of xnu?
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<roxfan>
there's osfmk/console/video_console.c
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<roxfan>
but I only see it called with NULL o.o
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<marcan>
puhitaku: the bootloader sets up the framebuffer for us
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<marcan>
you just write to memory
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<marcan>
of course actually implementing the display controller so you can do things like plug in external displays will be more fun
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<puhitaku>
i've been forgotten that the boot menu showed up in your broadcast *slaps forehead* sry for misunderstanding because of not having the real hardware for now
<marcan>
actually that boot menu isn't that
<marcan>
that "boot menu" is just an OSX app
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<marcan>
but the *apple* that shows up before that, with the "entering options" thing, *that* is the bootloader
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<puhitaku>
so we might be able to overwrite the white apple with the fresh asahi ringo logo ... that's cool, i hope the bootloader passes the fb as-is
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<jn__>
... or with Bad Apple frames :)
<diz3y>
jn__: loading animation \o/
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<puhitaku>
jn__: it'll be so fun to show off with Bad Apple :O
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<roxfan>
make it an easter egg
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