Add release notes for 2021.03.01

Signed-off-by: David Abdurachmanov <[email protected]>

ReleaseNotes/2021.03.01.md

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+# Release Notes for 2021.03.01
+
+This release includes major changes compared previous Freedom Unleashed SDK and thus is **experimental** at this stage. The main changes include:
+
+- OpenSBI was updated to support ``gpio-poweroff` on HiFive Unmatched using SBI v0.1 legacy `sbi_shutdown()` call.
+- U-Boot was updated for HiFive Unmatched:
+	+ Modified device tree to include `gpio-poweroff` node needed for OpenSBI.
+	+ Added reset for USB Hub, PCIe-USB bridge, ULPI device via GPIOs.
+	+ Set default PWM state in SPL.
+	+ Set D2 LED to yellow in SPL.
+	+ Set D2 LED to purple in U-Boot proper.
+	+ Set D2 LED to blue before `sysboot` is executed in the extlinux bootflow.
+	+ Fix PWM command.
+	+ Enable all FAN headers on by default.
+	+ Add I2C into SPL.
+	+ Add ability to check PCB revision.
+	+ Set default clock to 1.2GHz
+- Kernel was updated for HiFive Unmatched:
+	+ Version updated to v5.11.10.
+	+ Added `gpio-poweroff` node to the device tree.
+	+ Added D12 (green) LED.
+	+ Added D2 RGB LED.
+	+ Disabled `CONFIG_HVC_RISCV_SBI` in defconfig.
+	+ Disabled `CONFIG_SERIAL_EARLYCON_RISCV_SBI` in defconfig (kernel can handle `earlycon` directly).
+	+ Removed `CONFIG_SIFIVE_BEU` from defconfig (not used, the driver is not included).
+	+ Removed "A00" from the model name in device tree.
+	+ Adjusted errata options based on a newer patchset version.
+		* Enabled new `ERRATA_SIFIVE_CIP_1200` in defconfig.
+- Added udev rules for HiFive Unmatched:
+	+ Set D12 (green) LED to heartbeat trigger.
+	+ Set D2 RGB LED to white color as the initial state.
+- Added systemd unit and timer to set D2 RGB LED to green color 3 minutes after `getty.target` target.
+- Replaced `earlycon=sbi` with `earlycon` within `extlinux.conf`.
+- Removed `xscreensaver` package as it conflict with Xfce4 screen saver.
+- Disabled `psplash` systemd unit by default (framebuffer in most cases is not available before it starts).
+- Replaced `wireless-regdb` with `wireless-regdb-static` to allow kernel directly loading regulatory database without a user space daemon.
+
+## Known Issues
+
+1. Avoid overclocking SoC using CPUFreq if you are using HiFive Unleashed Expansion Board from Microsemi as this will hang the board. Hard reset will be required.
+2. If Xfce4 desktop disk image is used with HiFive Unleashed Expansion Board and GPU then rebooting is required after the 1st boot.
+3. Newer OE/Yocto buildtools could cause build issues for `nspr-native` package. Use `-r yocto-3.2_M2 -t 20200729` as described in README file if you are using OE/Yocto buildtools. See Yocto bug [#14112](https://bugzilla.yoctoproject.org/show_bug.cgi?id=14112)
+4. We have found an issue with SanDisk "A2" microSD cards and thus do not recommend them.
+5. Xfce4 file manager (Thunar) might crash due to a bug in exo related to "Icon View". We advice to switch to "List View" or "Compact View" under "View" menu.
+6. If the desktop is unresponsive/frozen (i.e. the keyboard doesn't work or/and the mouse doesn't work, the clock is not updating, etc.) try `systemctl restart display-manager` from the serial console.
+7. If the keyboard or/and mouse is not responsive/frozen check if the input device is available under `libinput list-devices` and if events are registered by`libinput debug-events` in the console. If events are registered try the command from #6 above otherwise manually unplug and plug the keyboard or/and mouse.
+8. If your desktop is very slow check Mesa OpenGL rendered (`glxinfo | grep OpenGL`). If it is `OpenGL renderer string: llvmpipe` restart the system. In rare cases Mesa might fallback to `llvmpipe`, but restart usually resolved the issue.
+9. Restart is not implemented in software for HiFive Unmatched.