Block Device Support List

Mbed CE features some useful generic block device drivers, such as SPIFBlockDevice for SPI flashes and I2CEEBlockDevice for EEPROMs. These drivers support a wide range of block devices. However, there is not a great reference of what specific part numbers have actually been tested with these drivers -- some memory chips do work while others do not comply with the standard and currently do not work.

To address this issue, this page will list which specific memory chips have been tested with which drivers.

SPIFBlockDevice (SFDP SPI flashes)

Part Number	Size	Results	Notes
S25FL256L	32MiB	Works but with caveat, can init, erase, program, but eraze_size is different from default 4KB. Sectors on some S25FL256L are organized as hybrid combination of 4KB and 64KB sectors. TO be safe, please use 64KB or larger as erase size.	Newer generation such as S25FL256S doesn't work.

QSPIFBlockDevice (QSPI flashes)

Part Number	Size	Results	Notes
Renesas AT25SF128A	16MiB	Works. Requires the following mbed_app.json settings in target_overrides: "qspif.QSPI_POLARITY_MODE": "QSPIF_POLARITY_MODE_1", "qspif.enable-and-reset": true	This flash needs special settings since it has a VERY basic SFDP table.
Micron MT25QL512	32MiB	Works.	Tested on DISCO_F746NG board

OSPIFBlockDevice (OSPI flashes)

Part Number	Size	Results	Notes

I2CEEBlockDevice (I2C EEPROMs)

Part Number	Size	Results	Settings
Microchip 24FC02-I/SN	2kiB	Works, but large reads have a problem. Fast Mode Plus not tested yet.	size=2048, address=0xA0, block=8, address_is_eight_bit=true
Microchip 24FC64-I/SN	64kiB	Works. Fast Mode Plus not tested yet.	size=65536, address=0xA0. block=32, address_is_eight_bit=false
Hua Hong K24Cxx	256B-2kiB	Works according to here	address=0xA0 (by default), block=8 or 16, address_is_eight_bit=true