#########################################################################
# File...: /boot/platform/hwm_bw/config.txt
# Purpose: Configuration file for the RPi first stage Boot Loader.
#          * Handles Flattened Device Tree (and Overlays) and various
#            hardware settings.
#          * Chain loads the 2nd-stage U-Boot loader, which boots the
#            Linux Kernel and Slackware OS.
# Date...: 22-Dec-2021
#########################################################################
# Notes
# [1] This file is not actively managed by the Slackware OS.
#     It's statically created by the 'inst_dskimg.build' script:
#     http://ftp.arm.slackware.com/slackwarearm/platform/aarch64/bootware/src/inst_dskimg.build
# [2] The Linux Kernel and Slackware OS configuration is found within
#     the Slackware OS here:
#     /boot/extlinux/extlinux.conf
# [3] For detailed information about this configuration file and the possible
#     configuration directives, see:-
#     https://www.raspberrypi.com/documentation/computers/config_txt.html
#########################################################################

# Raspberry Pi5 settings:
[pi5]
# Enable DRM VC4 V3D driver:
dtoverlay=vc4-kms-v3d-pi5
max_framebuffers=2
# Serial port provided by RP1 chip in Rpi5
enable_rp1_uart=1
uart_2ndstage=1

# Raspberry Pi4/400 settings:
[pi4]
arm_64bit=1
# For the RPi Kernel fork, uncomment these two directives:
# Assign 128MB of RAM to the GPU:
#gpu_mem=128
#dtoverlay=vc4-kms-v3d
# For the mainline Kernel (Slackware AArch64 standard):
dtoverlay=vc4-kms-v3d-pi4

max_framebuffers=2
hdmi_enable_4kp60=1
# Interested in overclocking options?
# See: https://www.raspberrypi.com/news/introducing-turbo-mode-up-to-50-more-performance-for-free/
#
# Experimental for RPi4 model B:
#device_tree=bcm2711-rpi-4-b.dtb

# Raspberry Pi400 settings. These would override those configured
# for all RPi4 models.
#[pi400]
# Increase clock speed from 1.5GHz to 1.8GHz:
#arm_boost=1

# Raspberry Pi3 settings:
[pi3]
arm_64bit=1
device_tree=bcm2837-rpi-3-b.dtb
# Raspberry Pi3+ settings:
[pi3+]
device_tree=bcm2837-rpi-3-b-plus.dtb
arm_64bit=1

# General settings for Raspberry Pi Hardware Models:
[all]
# Serial settings:
#init_uart_baud=115200
enable_uart=1
# Note: If you need to use BlueTooth, you should disable the UART:
#enable_uart=0

# For the VC4 driver (according to the help text within the
# Kernel configuration!)
avoid_warnings=2

# To debug the RPi native Boot Loader:
#uart_2ndstage=1

# Help with using KVM's:
#hdmi_force_hotplug=1

##BL_NATIVE:SLKInstaller
# Boot the Slackware Installer using the Raspberry Pi's native Boot Loader.
# Whilst the OS is booted using U-Boot, using the native Boot Loader enables
# the Installer to be booted on machines that have an old version of the boot
# loader in the EEPROM, which doesn't work with U-Boot.
kernel=slk_image-armv8
initramfs slk_initrd-armv8 followkernel
##BL_NATIVE:SLKInstaller

##BL_UBOOT:SLKInstaller
# Boot the Slackware Installer using U-Boot.  This is no longer the standard
# since it fails with older bootware on the Raspberry Pi5.
# The OS will be booted using U-Boot after the user has performed a bootware update
# to the EEPROM from the post installation phase of the Installer.
#kernel=slk_u-boot.bin
##BL_UBOOT:SLKInstaller

# Chain load the 2nd stage U-Boot Boot Loader:
# This is the Slackware standard.
##BL_UBOOT:SLKOS
#kernel=slk_u-boot.bin
##BL_UBOOT:SLKOS

# Boot the Slackware OS using the Raspberry Pi native Boot Loader.
# This is not the standard but is here for completeness and for troubleshooting/development.
# If you use this, you'll need to setup the 'cmdline.txt' file appropriately.
#
# The Slackware Linux Kernel and OS Initrd (Operating System Initial RAM Disk)
# are maintained by the post install helper script within the 'a/kernel' package.
##BL_NATIVE:SLKOS
#kernel=slk_image-armv8
#initramfs slk_initrd-armv8 followkernel
##BL_NATIVE:SLKOS

#########################################################################
# Device Tree Overlays
# See the README /boot/platform/hwm_bw/overlays/README
# (Note: this 'README' is from the RPi Bootware repository)
#########################################################################

# Real Time Clocks on the I2C bus (connected to the GPIO pins):
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on
#dtoverlay=i2c-rtc,ds1307
#dtoverlay=i2c-rtc,pcf85063

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18