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Raspberry Pi 4

Сообщений 1 страница 7 из 7

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Raspberry Pi, кстати, не полностью открыта.

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БудДен
А что там закрыто? Вроде уже всё открыли.

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Хотя да закрыто, поэтому я Банана Pi советую.

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Вот документация по малинке, там конечно многого не хватает
https://static.docs.arm.com/ddi0487/ea/ … 1574956729
https://www.electronicoscaldas.com/data … oadcom.pdf
https://www.raspberrypi.org/documentati … minary.pdf
https://github.com/raspberrypi/document … aspberrypi

Отредактировано Павиа (2020-01-10 20:45:19)

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https://github.com/christinaa/rpi-open-firmware
Open source VPU side bootloader for Raspberry Pi.

a small firmware for the RPi VPU, capable of initializing UART, VPU PLL (PLLC), and ARM itself. It's intended as a libre replacement for the stock bootcode.bin normally loaded from the SD card. Additionally, there is a second-stage chainloader running on ARM capable of initializing eMMC, FAT, and the Linux kernel.

The VC4 part initializes PLLC and moves VPU over to it, and then brings up UART. It performs SDRAM initialization, mapping it to 0xC0000000 (uncached alias). Next, ARM is initialized, and the embedded bootloader is mapped to ARM address 0x0. arm_chainloader is then executed.

License: GPLv2+
Broadcom headers: 3-Clause BSD

Отредактировано Лис (2020-01-11 03:50:10)

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https://magpi.raspberrypi.org/articles/raspberry-pi-4-specs-benchmarks
https://wiki.osdev.org/Raspberry_Pi_4

"the instruction set of VC6 has been renewed from VC4 and some new functions such as MMU is introduced"

"The VideoCore VI GPU is a very different architecture (e.g. with MMU, without 2 separate register files AFAIK), so supporting it require rewriting most of the compiler."

"Though the basic instruction set (add/mul ALU dual issue, three delay slots et al.) remains same as VideoCore IV QPU of Raspberry Pi 1/2/3, the usages of some units are dramatically changed. For instance, the TMU can now write to memory in addition to read."

Отредактировано Лис (2020-01-11 04:16:11)

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Инструкция по установке gentoo на raspberry pi3 (такой же набор инструкций как у pi4)

https://wiki.gentoo.org/wiki/Raspberry_ … it_Install

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