pieeprom-2020-07-31.bin - Standardize USB port power off across Pi4 models

Author: timg236

firmware/beta/pieeprom-2020-07-31.bin

@@ -3,6 +3,16 @@
 USB MSD boot also requires updated beta GPU firmware. Please read
 https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
 
+## 2020-07-31 Standardize USB port power control accross board revisions - BETA
+   * Turn off USB power power for 1-second regardless of boot-mode. This appears
+     to resolve an issue on R1.3 and older board revisions where some USB
+     devices would fail upon reboot. On R1.4 USB port power is turned off
+     automatically by the PMIC so this is just held in reset for longer. For
+     earlier board revisions the USB port power is explicitly turned off via
+     XHCI.
+     This can be overriden via USB_MSD_PWR_OFF_TIME in the EEPROM config.
+   * Update the to latest Broadcom memsys FW - no significant functional change.
+
 ## 2020-07-20 Promote 2020-07-16 bootloader and VL805 0138A1 FW to stable - STABLE
    * Promote the latest beta to stable as the next production firmware release
      candidate.