Merge branch 'master' into debian/buster

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Serge Schneider
2021-06-21 16:01:30 +01:00
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USB MSD boot also requires the firmware from Raspberry Pi OS 2020-08-20 or newer.
https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
## 2021-06-17 - Avoid unnecessary PCIe probe on CM4 - BETA
* Avoid default PCIe / XHCI probe on CM4 unless required for the current boot
mode (USB_MSD or NVME).
* Leave PCIe RC in reset state when loading start.elf except for USB-MSD mode.
## 2021-06-11 - Add USB_MSD_STARTUP_DELAY option - BETA
* Minor update to BRCM SDRAM settings.
* Add USB_MSD_STARTUP_DELAY option (default 0 option). This adds a configurable