AM335x Linux NOR flash driver

Hi Sankar,

Are you referring to the SPI NOR flash on the AM335x GP EVM?

Best regards,
Miroslav

Hi Miroslav,

No. I am in need for Parallel NOR flash; which is connected to GPMC.

Sankar, if the NOR flash is CFI compliant, the CFI command-set drivers are located in <linux_dir>/drivers/mtd/chips/.

The three command sets are:

• cfi_cmdset_0001.c: Intel Extended Vendor Command Set (ID 0x0001)
• cfi_cmdset_0002.c: AMD & Fujitsu Standard Vendor Command Set (ID 0x0002)
• cfi_cmdset_0020.c: ST Advanced Architecture Command Set (ID 0x0020)

The generic utility functions, not dependent on command set are inside <linux_dir>/drivers/mtd/chips/cfi_util.c.

The mapping drivers for chip access are inside <linux_dir>/drivers/mtd/maps/. The physmap.c driver is the generic mapping driver. If you can't use the generic physmap.c driver with your flash, you may use it as a reference to write your own mapping driver.

For more info please read the last two paragraphs here: http://www.righthandtech.com/embedded-linux-managing-memory.php#Flash_Chip_X_Supported

Best regards,
Miroslav

Thanks for the pointers, I was referring the below link for AM3517. If we just use similar way with AM335X and the driver that you had mentioned, that should be sufficient right?

http://processors.wiki.ti.com/index.php/AM35x-NOR-Flash-Support-ApplicationNote#Building_the_Linux_Kernel

Sankar, I haven't really tried this, but I guess so, yes.

Best regards,
Miroslav