Improve boot time on the RaspberryPi

[alloncm]

Currently the setup described the RaspberryPi section takes about 15 seconds to boot, I want to cut it to 1-3 seconds to achieve an authentic feeling as much as I can.

I believe running bare metal could help achieve this goal.

This issue depends on this #123 and is used to collect all the resources in one place

[alloncm]

http://intermezzos.github.io/book/second-edition/hello-world/setup.html

[alloncm]

https://lowenware.com/blog/aarch64-bare-metal-program-in-rust/

[alloncm]

https://youtu.be/jZT8APrzvc4

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https://jsandler18.github.io/

[alloncm]

lib_gb must not use std.

Resource - https://rust-lang.github.io/async-fundamentals-initiative/explainer/async_fn_in_dyn_trait/avoiding_allocation.html

[alloncm]

Log with this - https://leiradel.github.io/2019/02/10/The-Mini-UART.html

[alloncm]

see - raspberrypi/linux#4123

[alloncm]

https://forums.raspberrypi.com/viewtopic.php?t=328000

[alloncm]

https://www.youtube.com/watch?v=hSJWbmiQfck

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https://www.rpi4os.com/part5-framebuffer/

[alloncm]

https://github.com/raspberrypi/linux/blob/2aae4cc63e30f99dd152fc63cc4a67ca29e4647b/drivers/firmware/raspberrypi.c

[alloncm]

https://elinux.org/RPi_Framebuffer

[alloncm]

https://forums.raspberrypi.com/viewtopic.php?t=38525

[alloncm]

https://forums.raspberrypi.com/viewtopic.php?t=262772

[alloncm]

https://forums.raspberrypi.com/viewtopic.php?t=219212

[alloncm]

https://github.com/michalsc/Emu68/wiki/AArch64

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https://developer.arm.com/documentation/den0013/d/Boot-Code/Booting-a-bare-metal-system

[alloncm]

https://wiki.osdev.org/Raspberry_Pi_Bare_Bones_Rust

[alloncm]

s-matyukevich/raspberry-pi-os#8

[alloncm]

https://stackoverflow.com/questions/42824706/qemu-system-aarch64-entering-el1-when-emulating-a53-power-up

[alloncm]

https://developer.arm.com/documentation/ddi0406/cb/System-Level-Architecture/The-System-Level-Programmers--Model/ARM-processor-modes-and-ARM-core-registers/ARM-processor-modes?lang=en

[alloncm]

https://github.com/BrianSidebotham/arm-tutorial-rpi

[alloncm]

https://github.com/LdB-ECM/Raspberry-Pi/blob/master/10_virtualmemory/SmartStart32.S

[alloncm]

https://forums.raspberrypi.com/viewtopic.php?t=168976

[alloncm]

http://classweb.ece.umd.edu/enee447.S2021/baremetal_boot_code_for_ARMv8_A_processors.pdf

[alloncm]

https://www.macs.hw.ac.uk/~hwloidl/Courses/F28HS/Docu/DEN0013D_cortex_a_series_PG.pdf

[alloncm]

Hard floats enable - https://forums.raspberrypi.com/viewtopic.php?t=11183

[alloncm]

Hard float is an abibthing - perhaps I dont have to use nightly to enable this feature https://forums.raspberrypi.com/viewtopic.php?t=11183

[alloncm]

Interesting config.txt - https://github.com/isometimes/rpi4-osdev/tree/master/part10-multicore

[alloncm]

Sd card - https://forums.raspberrypi.com/viewtopic.php?t=202355

[alloncm]

Another sd card post - https://forums.raspberrypi.com/viewtopic.php?t=279789

[alloncm]

Sd card on rpi4 https://forums.raspberrypi.com/viewtopic.php?t=308089

[alloncm]

FAT32 docs

• Old docs with LFN - https://www.cs.fsu.edu/~cop4610t/assignments/project3/spec/fatspec.pdf
• New docs without LFN - https://academy.cba.mit.edu/classes/networking_communications/SD/FAT.pdf
• Cool visuals - http://www.c-jump.com/CIS24/Slides/FAT/FAT.html
• LFN visuals - https://www.ntfs.com/fat-filenames.htm
• Wikipeida page - https://en.wikipedia.org/wiki/Design_of_the_FAT_file_system
• More wikipedia page - https://en.wikipedia.org/wiki/File_Allocation_Table#FAT32
• Shitty Rust docs - https://www.sobyte.net/post/2022-01/rust-fat32/
• Cool slides - https://cscie92.dce.harvard.edu/fall2022/slides/FAT32%20File%20Structure.pdf

[alloncm]

Power Management:

• https://github.com/wizofe/rust-raspi3-tutorial/tree/master/0A_power
• https://www.kernel.org/doc/html/v5.5/watchdog/watchdog-api.html

[alloncm]

Consider use this lib - https://crates.io/crates/heapless