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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 2/22/22 16:13, Michael Walle wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Am 2022-02-22 14:54, schrieb Tudor.Ambarus@microchip.com: >> On 2/21/22 09:44, Michael Walle wrote: >>> EXTERNAL EMAIL: Do not click links or open attachments unless you know >>> the content is safe >>> >>> Am 2022-02-18 15:58, schrieb Tudor Ambarus: >>>> Fortunately there are controllers >>>> that can swap back the bytes at runtime, fixing the endiannesses. >>>> Provide >>>> a way for the upper layers to specify the byte order in DTR mode. >>> >>> Are there any patches for the atmel-quadspi yet? What happens if >> >> not public, but will publish them these days. >> >>> the controller doesn't support it? Will there be a software fallback? >> >> no need for a fallback, the controller can ignore op->data.dtr_bswap16 >> if >> it can't swap bytes. > > I don't understand. If the controller doesn't swap the 16bit values, > you will read the wrong content, no? > In linux no, because macronix swaps bytes on a 2 byte boundary both on reads and on page program. The problem is when you mix 8D-8D-8D mode and 1-1-1 mode along the boot stages. Let's assume you write all boot binaries in 1-1-1 mode. When reaching u-boot if you enable 8D-8D-8D mode, when u-boot will try to get the kernel it will fail, as the flash swaps the bytes compared to what was written with 1-1-1 mode. You write D0 D1 D2 D3 in 1-1-1 mode and when reaching u-boot you will read D1 D0 D3 D2 and it will mess the kernel image. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/