SD card high-speed/low-voltage mode can only be exited by powercycling.
Pi 4s before rev 1.4 lack the power switch required to do this, so
must resort to a global reset that turns off many things, including
SDRAM.
To ensure correct operation, the bootloader checks that the SD I/O
voltage is the expected 3.3V, forcing a power cycle if it isn't.
However, this doesn't take advantage of presence of the dedicated
SD power switch, always forcing a global reset, a consequence of which
can be the loss of SDRAM content - including any ramoops dump of the
crash logs.
Make the bootloader more SD_PWR_ON aware, only triggering a global
reset if one isn't found.
See: https://github.com/raspberrypi/linux/issues/5298
* arm_dt: Consult the hat_map for all HATs
* USB boot - ignore RP2 / RP3 MSD device in BOOTSEL mode.
* recovery.bin - Fix erase_eeprom to not block reboot_recovery
* Fix self-update to continue to boot instead of retrying forever
if the EEPROM is write protected.
https://github.com/raspberrypi/rpi-eeprom/issues/597
* Enable the usage of program_rpiboot_gpio in config.txt for recovery.bin
without requiring secure-boot to be enabled.
This may be useful CI systems provisioning images on Pi4B / Pi400 via RPIBOOT.
This is an OTP setting and cannot be reverted after programming.
See https://www.raspberrypi.com/documentation/computers/config_txt.html#program_rpiboot_gpio
* Add timestamps to UART log messages.
* Add support for [tryboot] conditional the bootloader EEPROM
config file.
See: https://github.com/raspberrypi/rpi-eeprom/issues/454
* Fix MAX_RESTARTS parameter
See: https://github.com/raspberrypi/rpi-eeprom/issues/576
* Add recovery_reboot option to config.txt for rpiboot which causes
the system to reboot after updating the bootloader.
* Improve secure-boot OTP provisioning logging.
* Fix setting to enable secure-boot mode on Pi4B
* Switch to building the Pi4 firmware from the common Pi4/Pi5
mainline release. This doesn't change the Pi4 features
but should make it quicker to release bug fixes in common code.
* Fix issue that caused the TRYBOOT flag to be lost in secure-boot mode.
* dtoverlay: Use %u when converting u32s to strings
See: https://github.com/raspberrypi/linux/issues/6039
* Improved debug messages for secure-boot.
* Generate the bootloader diagnostics qrcode at run time.
