Hi, I am currently experimenting with Trustzone on Freescale boards, having Android/Linux in the normal world (NW) and a custom baremetal mini-os in the secure world (SW).

My first board was a sabre imx6Q-SDP [1]. In order to boot both OS, we used the mx6sabresd_spl_defconfig configuration (with a few patches to support our system) so the SPL (in Secure mode) loads u-boot/Linux and our OS in memory, gives control to our OS, which at some point makes a switch to NW and start the second u-boot (which will start Linux).

I am now trying to port our work to another imx6 board [2] based on a imx6Q-lite, using Boundary Devices clone of u-boot [3]. In this setting, u-boot starts a Linux in the SW. I made a few attempts at patching u-boot to start Linux in NW, but I failed.

Since neither in the mainline u-boot nor their patched version provides a "SPL" configuration for the sabre lite, I am looking for a way to build it myself. Is there a roadmap to build a "SPL" configuration from a "normal" configuration in u-boot ? Or is there a way to configure u-boot so that Linux is started in the NW instead of the SW ?

Best regards, Vincent

[1]: http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/i...

[2]: https://boundarydevices.com/product/sabre-lite-imx6-sbc/

[3]: https://github.com/boundarydevices/u-boot-imx6 nitrogen6q_defconfig