IMPORTANT: Make sure to upgrade prebootloader-part1 before system or bootloader.

Problem

1. We are unable to write anything over 8 bytes at a time to the QSPI flash.
2. QSPI flash clock speed and IO mode (2IO/4IO) are not correctly calibrated on boot
3. Erasures do not use 32K and 64K operations where possible

Solution

1. Manually perform write transactions (in appropriate IO mode depending on flash type and hardware) and write up to 256 bytes at a time which is what flashes normally support
2. Change drive mode on QSPI flash pins and 'guess' correct dummy cycles of the flash in flash initialization
3. For erasures spanning multiple 4k blocks use optimized 32K and 64K operations, which are quicker. This should help OTA times.

To validate

1. Sleep needs to be double checked including power measurements (could be leakage due to changed pin modes of QSPI pins)
2. OTP operations

Steps to Test

Make sure to upgrade prebootloader-part1 before system.

• wiring/no_fixture_stress validates that the flash is in correct mode.

Example App

N/A

References

N/A

Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)