Add support for Winbond W25N NAND flash

[julianoes]

Solved Problem and solution

This brings support for the Winbond W25N NAND flash chip specifically W25N01GV chip with 128 MB.

NAND flash is used together with littlefs, updated to v2.5.1.

This driver is bench tested using the KakuteH7v2 and will be used for the Gear Up AirbrainH743 as well.

Changelog Entry

For release notes:

Feature
Documentation: Support for the Winbond W25N NAND flash chip specifically W25N01GV.

Alternatives

No support for NAND flash.

Test coverage

Bench tested, manually and using logger.

nsh> sd_bench -b 2048 -r 5
INFO  [sd_bench] Using block size = 2048 bytes, sync=0
INFO  [sd_bench] 
INFO  [sd_bench] Testing Sequential Write Speed...
INFO  [sd_bench]   Run  0:  1229.48 KB/s, max write time: 6 ms (= 333.33 KB/s), fsync: 5 ms
INFO  [sd_bench]   Run  1:  1226.24 KB/s, max write time: 21 ms (=  95.24 KB/s), fsync: 3 ms
INFO  [sd_bench]   Run  2:  1228.06 KB/s, max write time: 8 ms (= 250.00 KB/s), fsync: 4 ms
INFO  [sd_bench]   Run  3:  1228.49 KB/s, max write time: 12 ms (= 166.67 KB/s), fsync: 3 ms
INFO  [sd_bench]   Run  4:  1230.06 KB/s, max write time: 22 ms (=  90.91 KB/s), fsync: 4 ms
INFO  [sd_bench]   Avg   :  1228.46 KB/s
INFO  [sd_bench]   Overall max write time: 22 ms

Context

Also see: apache/nuttx#17552 and apache/nuttx#17706

[Igor-Misic]

Looks good to me. We should aim to rename /fs/microsd to something more generic, or storage related in the future.

[PetervdPerk-NXP]

Looks good to me. We should aim to rename /fs/microsd to something more generic, or storage related in the future.

Actually you can do that easily
See

PX4-Autopilot/Kconfig

Lines 188 to 190 in ec8f343

	config BOARD_ROOT_PATH
	string "PX4 Root file path"
	default "/fs/microsd"

Default is /fs/microsd but you can also set CONFIG_BOARD_ROOT_PATH to /fs/nand

[julianoes]

Fixed what came up during review, merging.