Implement use_global_block_protection_lock. Add/fix Microchip SST26VFxxxB parts

[eightycc]

SST26VF064B requires that the IOC bit in its configuration register be set to 1 to enable QSPI commands. The IOC bit is effectively a QSPI enable bit for this part.

Adds use_global_block_protection_lock to indicate that a part needs a ULBPR (Global Block Protection Unlock) command to write-enable the entire flash.

When updated nvm.toml is picked up by CircuitPython, this will resolve issues adafruit/circuitpython#8047 and adafruit/circuitpython#10172 in combination with the PR for 10172.

[eightycc]

@jepler Please review.

[eightycc]

Converted to draft pending more testing.

[dhalbert]

Hi, is this still pending? I have another potential user for SST26VF064B I'm supporting

[eightycc]

Hi, is this still pending?

It is. The SST26VF064B requires some additional special casing. There are hard-coded status register bit assignment assumptions in CP flash code that are not right for this part.

[ross-satchell]

I am also working on a CircuitPython board that would use this part. Looking forward to a solution.

[dhalbert]

This looks good! Would you be willing to add SST26VF032B in this PR too? Here it is. I double-checked the datasheet and verified the memory_type and capacity.

# Settings for the Microchip SST26VF032B 16Mb (2MiB) QSPI flash.
# Datasheet: https://www.microchip.com/en-us/product/SST26VF032B
total_size = 0x400000 # 4 MiB
memory_type = 0x26
capacity = 0x42
start_up_time_us = 10000
max_clock_speed_mhz = 104
single_status_byte = false
write_status_register_split = false
quad_enable_bit_mask = 0x02
quad_enable_status_byte = 0
6b_quad_read = true
32_qspi_write = true
has_sector_protection = true
use_global_block_protection_lock = true

[dhalbert]

The 64 file does not have a newline at the end.

[eightycc]

@dhalbert Hang on, I'm not quite done.

[eightycc]

@dhalbert All set. Apologies for the churn, I had to learn how these toml files cascade. I'll push the PR for adafruit/circuitpython#10172 once this PR is merged.

[eightycc]

@dhalbert Missed your earlier request for the 032 part. I'll add it in the morning.

Added.

[dhalbert]

@tannewt could you check, based on your nvm.toml experience?

[dhalbert]

Thanks!