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main/postmarketos-mkinitfs-hook-apx: new aport (MR 4231)

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Nvidia Tegra devices have APX mode which allows to flash/debrick
a device even with broken bootloader. It also allows to sideload
bootloader which is useful when porting a new bootloader.

Some devices have a key combination to enter this mode, some devices
don't have one. This hook alters two Tegra PMC registers which
causes device to enter APX mode. It works on the most devices
including some of those that don't have a key combination for APX.

Usage:
pmbootstrap initfs hook_add apx
pmbootstrap flasher boot

[ci:skip-build]: already built successfully in CI
This commit is contained in:
Anton Bambura 2023-07-05 20:01:53 +03:00 committed by Oliver Smith
parent 757aa80636
commit dd5f448bee
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1
main/postmarketos-mkinitfs-hook-apx/00-apx.files Normal file
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/usr/bin/devmem2

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main/postmarketos-mkinitfs-hook-apx/00-apx.sh Normal file
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#!/bin/sh
echo "PMOS: Entering APX" > /dev/kmsg
devmem2 0x7000E450 w 0x02
devmem2 0x7000E400 w 0x10

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main/postmarketos-mkinitfs-hook-apx/APKBUILD Normal file
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# Documentation: https://wiki.postmarketos.org/wiki/Nvidia_Tegra#APX
# Maintainer: Jenneron <jenneron@protonmail.com>
pkgname=postmarketos-mkinitfs-hook-apx
pkgver=1
pkgrel=0
pkgdesc="Enter APX on boot for NVIDIA Tegra devices"
url="https://postmarketos.org"
depends="postmarketos-mkinitfs devmem2"
source="00-apx.sh 00-apx.files"
arch="armv7"
license="GPL-2.0-or-later"
options="!check"
package() {
install -Dm644 "$srcdir"/00-apx.sh \
"$pkgdir"/usr/share/mkinitfs/hooks/00-apx.sh
install -Dm644 "$srcdir"/00-apx.files \
"$pkgdir"/usr/share/mkinitfs/files/00-apx.files
}
sha512sums="
9dba7ac8266ed3bd74895a7f1d0353d3a01e6b63c78e9eb6bf33a23a4a86fef647858e2069e7d82f3dac4e9b3f4d7b6239373018212f0dd6dc01ad9f15e18d2a 00-apx.sh
3fbe0463aa08e7a1ed8141c2d1d84e0e2ced53dc9b0d3a06dbca4a302bf5d96bc1a2e5c9a9600efc19b57c178326f4f0194a8839bb50de3192d8f19cc92fb980 00-apx.files
"