topic LS1021A-RWT PNOR in Layerscape

LS1021A-RWT PNOR

renaud — Wed, 23 Nov 2022 15:35:19 GMT

Looking at U-boot (LSDK-21.08) I see that for the ls1021a-twr configuration file, there is a flag CONFIG_SYS_WRITE_SWAPPED_DATA which is used in the cfi_flash.c driver.

Does that mean the data bus connection to the NOR is bit swapped on the ls1021a-twr?

Cheers,

Renaud

Re: LS1021A-RWT PNOR

JosephAtNXP — Thu, 24 Nov 2022 17:19:41 GMT

Hi, renaud

No, it means that the bus connected to the NOR Flash is normal.

Regarding this application note regarding the bid and little endianness. The LS1 IFC uses big endian format, reversing it would set to you write to the NOR Flash normally.

Best regards,

Joseph Linares

Re: LS1021A-RWT PNOR

renaud — Thu, 01 Dec 2022 09:37:22 GMT

Thanks for the documentation. Byte-swap in the driver allows me to write to the flash. Still have to do the write buffer support as programming is very slow otherwise