topic Re: Parallel NOR-Flash of 16bit BUS and IVT data in i.MX Processors

Parallel NOR-Flash of 16bit BUS and IVT data

tamotsu — Mon, 25 Nov 2024 01:03:30 GMT

Hellow.

On page 1241 of the i.MX7D reference manual, the IVT header format diagram suggests that the value to be set would be 0xD1-0x0020-0x40 to .word 0xD1002040, but in the 20132 "i.MX6 IVT structure" Anson Huang answers that it should be .word 0x402000D1.

I think the manual says this is

0x400 = 0xD100

0x402 = 0x2040

but is that wrong?

Thank you.

Re: Parallel NOR-Flash of 16bit BUS and IVT data

Harvey021 — Tue, 26 Nov 2024 04:13:42 GMT

Hi,

tag = D1 is the first byte. The difference as Anson's should be caused by display options, like endian.

Regards

Harvey

Re: Parallel NOR-Flash of 16bit BUS and IVT data

tamotsu — Wed, 27 Nov 2024 00:04:05 GMT

Thank you Harvey021.

So Anson explained it in little-endian?

I'm confused because the reference manual says it's big-endian.

Re: Parallel NOR-Flash of 16bit BUS and IVT data

Harvey021 — Wed, 27 Nov 2024 09:31:33 GMT

The header ivt should be included in image by default, we don't need to modify it.

And we can try to dump it using command od w/t option little or big endian

od -x -N 48 --endian=little u-boot.imx

od -x -N 48 --endian=big u-boot.imx

Regards

Harvey