imx8ULP boot up for single mode

[zlxie]

In our project, only Cortex-A35 cores are used, and Cortex-M33F inside IMX8ULP won't be used.

If there is no M33 RT FW, IMX8ULP can boot up and work normally?

On IMX8ULP user manual P792 ,  12.1.2 Boot ROM  description as following:

A35 ROM is responsible for loading both AP FW and RT FW images (except for Fusion DSP FW and HiFi DSP FW images) in Single boot mode.

 It seems RT FW is always needed even if Cortes-M33F isn't used. Thanks.

[Harvey021]

It is not feasible because the SoC architecture of 8ULP limits many services that need to be provided by M33 (e.g. through rpmsg). If the M core is not started, the default sw sdk and many functions of Linux will be affected or unavailable.

Regards

Harvey

[zlxie]

On IMX8ULP EVK board, M33 is boot up through 8 bits SPI FLASH on Flexspi0. Can 1 bit or 4 bits SPI flash be used? how to configre the SPI flash bus width? Thanks.