[PATCH] mtd: spi-nor: Fix the qspi parallel memory issues

[Dominik Wernberger]

Hi Venkatesh,

Thanks for such a fast response.

Running ‘sf probe’ gives:
Flash: SF: Detected n25q256a with page size 512 Bytes, erase size 128 KiB, total 128 MiB

To be correct we use 2x MT25QL256ABA1EW9 [1, 2] which is basically the same as the n25q256a reported by sf.
In defconfig I’ve specified CONFIG_ENV_SECT_SIZE=0x00040000 which is divided by 2 in parallel memories
logic [3], resulting in the 128 KiB per Flash chip.

If you need any further information, please let me know.

[1] https://www.micron.com/products/storage/nor-flash/serial-nor/part-catalog/part-detail/mt25ql256aba1ew9-0sit
[2] https://xonstorage.blob.core.windows.net/pdf/micron_mt25ql256aba1ew90sit_apr22_xonlink.pdf
[3] https://lore.kernel.org/all/20240926045508.1492638-3-venkatesh.abbarapu@amd.com/

BR
Dominik

From: Abbarapu, Venkatesh <venkatesh.abbarapu at amd.com>
Sent: Tuesday, December 3, 2024 1:01 PM
To: Wernberger Dominik (1GS4) <dominik.wernberger at rohde-schwarz.com>
Cc: git (AMD-Xilinx) <git at amd.com>; jagan at amarulasolutions.com; Simek, Michal <michal.simek at amd.com>; trini at konsulko.com; u-boot at lists.denx.de; vigneshr at ti.com
Subject: *EXT* RE: [PATCH] mtd: spi-nor: Fix the qspi parallel memory issues

Hi Dominik,
Could you please let me know the details of the flash? I will check from my side.

Thanks
Venkatesh
From: Dominik Wernberger <dominik.wernberger at rohde-schwarz.com<mailto:dominik.wernberger at rohde-schwarz.com>>
Sent: Tuesday, December 3, 2024 5:21 PM
To: Abbarapu, Venkatesh <venkatesh.abbarapu at amd.com<mailto:venkatesh.abbarapu at amd.com>>
Cc: git (AMD-Xilinx) <git at amd.com<mailto:git at amd.com>>; jagan at amarulasolutions.com<mailto:jagan at amarulasolutions.com>; Simek, Michal <michal.simek at amd.com<mailto:michal.simek at amd.com>>; trini at konsulko.com<mailto:trini at konsulko.com>; u-boot at lists.denx.de<mailto:u-boot at lists.denx.de>; vigneshr at ti.com<mailto:vigneshr at ti.com>
Subject: Re: [PATCH] mtd: spi-nor: Fix the qspi parallel memory issues

Hello Venkatesh,

Is there any news on the status of this patch? I'm working with a Zynq 7z020 system where 2 Flashes
operate in parallel QSPI mode. This patch is essential for the correct Flash erase in U-Boot v2025.01-rc3.

Without this patch Flash erase fails on every second multiple of Flash erase section size (FESS). Failing
means that the Flash erase is not initiated or successful. I.e., the Flash section is not altered.

For example, lets assume a FESS with 0x20000 (128 kiB).

sf test 00000 20000 # Works
sf test 20000 20000 # Fails
sf test 40000 20000 # Works
sf test 60000 20000 # Fails
# ...

Note that executing

sf erase 20000 20000
SF: 131072 bytes @ 0x20000 Erased: OK

shows OK even though the Flash sector were not erased.

In case you have any new/rebased patches you want me to test, I would be happy to do so. I'm looking
forward getting this patch into mainline U-Boot.

Best Regards,

Dominik


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