QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Sigurd Hellesvik — Fri, 27 Mar 2026 08:36:29 GMT

This is taking more time than expected.
Thank you for your patience

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Macherla Swetha — Mon, 23 Mar 2026 09:58:18 GMT

ok thanks for your respose

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Sigurd Hellesvik — Wed, 18 Mar 2026 15:16:50 GMT

On our nRF5340DK we have a 16MiB external flash, so I do not have that much experience with larger external flash.

So I can not answer your questions outright.

Instead, I will connect our nRF9161DK external flash to a nRF5340 DK and try to use the full external flash in this way.

I have already started this, but it will likely take a couple of days more.

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Macherla Swetha — Tue, 17 Mar 2026 18:30:42 GMT

1. by register reading

uint32_t ifconfig0 = NRF_QSPI->IFCONFIG0;

/* Extract ADDRMODE field (2 bits) */

uint32_t addrmode =

(ifconfig0 & QSPI_IFCONFIG0_ADDRMODE_Msk)

>> QSPI_IFCONFIG0_ADDRMODE_Pos;

if (addrmode == NRF_QSPI_ADDRMODE_24BIT)

{

printk("QSPI Address Mode: 24-bit (3-byte)\n");

}

else if (addrmode == NRF_QSPI_ADDRMODE_32BIT)

{

printk("QSPI Address Mode: 32-bit (4-byte)\n");

}

else

{

printk("QSPI Address Mode: Unknown (%d)\n", addrmode);

}

2. by storing files in flash and as USB mass storage... if we are in 3-byte address mode and store files above 16MB .. drive not opening (asking for Format)

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Sigurd Hellesvik — Tue, 17 Mar 2026 15:21:29 GMT

[quote user=""]With SFDP BFP table → Flash does not enter 4-byte address mode[/quote]

Can you explain how you observe if the Flash is in 4-byte mode or not?

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Macherla Swetha — Tue, 17 Mar 2026 12:48:05 GMT

iam working on "MX25L51245G" not "mx25r6435f"(i will keep this as just lable name)

my flash is 64MB(mega byte)

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Sigurd Hellesvik — Tue, 17 Mar 2026 12:44:14 GMT

Hi,

[quote user=""]mx25r64: mx25r6435f@0 {[/quote]

Having a look at the datasheet for this one:

It looks like it is 64M-bit = 16MByte if I cound correctly.

And therefore you do not need 4-byte addressing for this SoC, right?

The story is different for the MX25L51245G, but this is not yet what you got in your overlay.

Could this explain the initial errors you see?

Regards,
Sigurd Hellesvik

RE: QSPI NOR Flash not entering 4-byte address mode when using SFDP BFP tablesfdp-s

Sigurd Hellesvik — Mon, 16 Mar 2026 14:09:01 GMT

Hi,

I am looking into this and will let you know what I find soon.

Regards,
Sigurd Hellesvik