julianoes opened a new pull request, #17552:
URL: https://github.com/apache/nuttx/pull/17552
## Summary
Add MTD driver for Winbond W25N series SPI NAND flash.
Currently supports W25N01GV (1Gbit/128MB).
**Features**:
- Standard SPI interface with configurable frequency (up to 104 MHz)
- Hardware ECC enabled by default
- Block erase with sleep-based wait (releases SPI bus)
- Page read/write with busy-wait for fast operations
**Limitations**:
- No bad block management (BBM). Factory bad blocks and runtime bad blocks
are not tracked.
- No bad block table (BBT) scanning at initialization.
- No Quad SPI support (standard SPI only).
- No access to spare area (64 bytes/page) or OTP region.
## Impact
- Adds driver, should not affect anything existing.
## Testing
Tested using:
- Board with STM32H743
- W25N01GV on SPI at 96 MHz with DMA enabled
- Flash mounted using littlefs
- Tested using sdbench
```
W25N: SPI freq: requested=104000000, actual=96000000 Hz
W25N: MTD registered at /dev/mtd0
LittleFS mounted at /mnt
NuttShell (NSH) NuttX-12.11.0
nsh>
nsh>
nsh> sdbench -b 2048 -r 5 -d 5000
Using block size = 2048 bytes, sync = false
Testing Sequential Write Speed...
Run 1: 1750.5 KB/s, max write time: 48.000 ms (41.7 KB/s), fsync: 2.000
ms
Run 2: 1739.8 KB/s, max write time: 84.000 ms (23.8 KB/s), fsync: 3.000
ms
Run 3: 1733.0 KB/s, max write time: 85.000 ms (23.5 KB/s), fsync: 3.000
ms
Run 4: 1763.7 KB/s, max write time: 32.000 ms (62.5 KB/s), fsync: 2.000
ms
Run 5: 1763.7 KB/s, max write time: 19.000 ms (105.3 KB/s), fsync:
2.000 ms
Avg : 1750.1 KB/s, 42.748 MB written.
Testing Sequential Read Speed...
Run 1: 4842.0 KB/s, max read/verify time: 4.0000 ms (500.0 KB/s)
Run 2: 4976.9 KB/s, max read/verify time: 4.0000 ms (500.0 KB/s)
Avg : 4901.4 KB/s, 42.748 MB and verified
```
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