Re: NOR access from ARM-BE toolchain

[Boris Brezillon <boris.brezillon@xxxxxxxxxxx>]

On Fri, 17 Aug 2018 10:54:24 +0000
Prabhakar Kushwaha <prabhakar.kushwaha@xxxxxxx> wrote:

> Hi Boris,
> 
> I am trying to access NOR flash with ARM running in big-endian mode.  But it is causing error as " do_map_probe() failed for type cfi_probe"
> 
> On our platform, The connection between Flash controller and NOR flash is little-endian.
> Here, ARM core running in littler endian mode with MTD_CFI_NOSWAP every things work fine. 
> 
> if we change ARM mode as big-endian, it start showing error as mentioned above. 
> Error is same even with MTD_CFI_BE_BYTE_SWAP option.   
> As per my understanding MTD_CFI_BE_BYTE_SWAP or MTD_CFI_LE_BYTE_SWAP deals with flash controller and flash connection.

If it works in little endian, you should enable MTD_CFI_LE_BYTE_SWAP
(or add the little-endian prop to the flash node in your DT).

> Not sure, if take care of Core endianness also. 
> 
> Please suggest!!
> 
> Regards,
> Prabhakar
> 


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/