Message ID | cover.1660291281.git.Takahiro.Kuwano@infineon.com |
---|---|
Headers | show |
Series | Discover current address mode by CRC | expand |
Hi Tudor, Have you had a chance to take a look? Thanks, Takahiro On 8/12/2022 5:06 PM, tkuw584924@gmail.com wrote: > From: Takahiro Kuwano <Takahiro.Kuwano@infineon.com> > > Hello, > > I introduced this series based on the discussion [0]. > > Patch#1 is needed to use READ_4B(13h) for offline CRC calculation. This > can replace spi_nor_read_raw() in SFDP, if it is OK. > > Path#2 implements address mode discovery by: > - determine factory default from BFPT DWORD16 > - read 4 bytes from address 0 by 13h opcode > - calculate CRC from 4 byte data by offline > - perform data integrity CRC op > - read data integrity CRC register by Read Any Reg with 3- and/or 4-byte > address bytes to determine the current address mode > > [0] https://patchwork.ozlabs.org/project/linux-mtd/patch/e47ed0aa3e1a6fdca7689434ce7dea99ff4826e7.1659764848.git.Takahiro.Kuwano@infineon.com/ > > Takahiro Kuwano (2): > mtd: spi-nor: core: Add a helper to read with alternative method > mtd: spi-nor: spansion: Discover current address mode by CRC > > drivers/mtd/spi-nor/core.c | 48 ++++++++++++ > drivers/mtd/spi-nor/core.h | 2 + > drivers/mtd/spi-nor/sfdp.h | 1 + > drivers/mtd/spi-nor/spansion.c | 130 +++++++++++++++++++++++++++++++++ > 4 files changed, 181 insertions(+) >
From: Takahiro Kuwano <Takahiro.Kuwano@infineon.com> Hello, I introduced this series based on the discussion [0]. Patch#1 is needed to use READ_4B(13h) for offline CRC calculation. This can replace spi_nor_read_raw() in SFDP, if it is OK. Path#2 implements address mode discovery by: - determine factory default from BFPT DWORD16 - read 4 bytes from address 0 by 13h opcode - calculate CRC from 4 byte data by offline - perform data integrity CRC op - read data integrity CRC register by Read Any Reg with 3- and/or 4-byte address bytes to determine the current address mode [0] https://patchwork.ozlabs.org/project/linux-mtd/patch/e47ed0aa3e1a6fdca7689434ce7dea99ff4826e7.1659764848.git.Takahiro.Kuwano@infineon.com/ Takahiro Kuwano (2): mtd: spi-nor: core: Add a helper to read with alternative method mtd: spi-nor: spansion: Discover current address mode by CRC drivers/mtd/spi-nor/core.c | 48 ++++++++++++ drivers/mtd/spi-nor/core.h | 2 + drivers/mtd/spi-nor/sfdp.h | 1 + drivers/mtd/spi-nor/spansion.c | 130 +++++++++++++++++++++++++++++++++ 4 files changed, 181 insertions(+)