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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 8/8/22 08:42, Takahiro Kuwano wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > On 8/8/2022 1:47 PM, Tudor.Ambarus@microchip.com wrote: >> On 8/6/22 09:34, tkuw584924@gmail.com wrote: >>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe >>> >>> From: Takahiro Kuwano >> >> Hi! >> >>> >>> s25hl02gt and s25hs02gt >>> >>> Add ID, flags, and fixup for s25hl02gt and s25hs02gt. >>> These parts are >>> - Dual-die package parts >>> - Not support chip erase >>> - 4-byte addressing mode by default >> >> CFR2N[7] CFR2V[7] says that: "For the DDP or QDP devices, if ADRBYT = 0 >> only the first 128 Mb of die 1 can be accessed." >> So there are flashes of the same family that are by default in 3 byte address >> mode. You added support just for a subset of them and used a generic name, >> which is not accurate, right? >> > We added model #15 (3-byte address mode by default) to address special > requirement from a customer who needs to use bootrom with 3-byte addressing. > Anyway, I overlooked model # difference. Thanks for pointing out this. > >> Can we instead make an algorithm to determine the current address mode? >> > I have just found that we can distinguish model # via BFPT DWORD16. > If Hardware reset, Software reset, or Power cycle can exit 4-byte address > mode, that means the device is 3-byte address mode by default. I don't think this will help us. It doesn't matter the default mode if you have a non volatile register that can be updated and changes the default mode. Are there any registers/data that can be read successively in 3 byte addr mode and then in 4 byte addr mode? We'll then compare what we receive from the flash with a known value and determine the mode. > The questions is can we implement in spi_nor_parse_bfpt() in sfdp.c or > post_bfpt_fixup() in manufacturer code? > -- Cheers, ta ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/