T1022 SPI Boot

[jack_mcculloch]

Hi,

We are working on a custom board with a T1022 processor and would like to boot from SPI flash memory.

We require 128MB of memory but the processor only supports 24-bit addressing when booting from SPI restricting addressable space to 16MB.

Is it possible to load the boot data using 24-bit addressing and then re-configure the SPI interface to use 32-bit addressing after so we can use 128MB of memory?  

[Pavel]

Usually SPI Flash does not support switching between 24-bit addressing and 32-bit addressing.

The T1022 PBL can be used for using 24-bit addressing mode and 32-bit addressing mode. See the Section 20.6.1 of the T1040 Reference Manual:

https://www.nxp.com/webapp/Download?colCode=T1040RM

Customers often use the I2C or NAND or eSDHC or 16/24-bit addressing SPI memory for loading the RCW and pre-boot initialization commands.

Another 32-bit SPI Flash can be used for loading date and Linux.

Have a great day,
Pavel Chubakov

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