topic How to examine startup-code and bootloader of linux Yocto? in i.MX Processors https://community.nxp.com/t5/i-MX-Processors/How-to-examine-startup-code-and-bootloader-of-linux-Yocto/m-p/686069#M106158 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I am building a trusted execution environment on IMX6Q with a Linux Yocto version in the untrusted processor mode. When I switch to non-secure for the first time after reset to load the linux kernel, I am flooded with data and prefetch abort exceptions as soon as I jump to the kernels bootloader.It also seems like, that those exceptions occur as soon as the MMU is switched on.</P><P>Booting the Kernel without changing to non-secure state works fine.</P><P>Is it possible, that the control bits of the non-secure copy of the first-stage page tables are written with the NS-Bit cleared which causes the MMU to refuse any access to those regions ?</P><P></P><P>Where can I find the startup code that is setting up the page tables in the Yocto-BSP for IMX6Q ?</P><P>How can I debug the Linux Bootloader?</P><P>Is it possible to simply change source code of the bootloader in the build-directory of the BSP and rebuild the image?</P><P></P><P>Thanks in advance,</P><P>Paul</P></BODY></HTML> Fri, 19 May 2017 07:53:13 GMT paulhilt 2017-05-19T07:53:13Z How to examine startup-code and bootloader of linux Yocto? https://community.nxp.com/t5/i-MX-Processors/How-to-examine-startup-code-and-bootloader-of-linux-Yocto/m-p/686069#M106158 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>I am building a trusted execution environment on IMX6Q with a Linux Yocto version in the untrusted processor mode. When I switch to non-secure for the first time after reset to load the linux kernel, I am flooded with data and prefetch abort exceptions as soon as I jump to the kernels bootloader.It also seems like, that those exceptions occur as soon as the MMU is switched on.</P><P>Booting the Kernel without changing to non-secure state works fine.</P><P>Is it possible, that the control bits of the non-secure copy of the first-stage page tables are written with the NS-Bit cleared which causes the MMU to refuse any access to those regions ?</P><P></P><P>Where can I find the startup code that is setting up the page tables in the Yocto-BSP for IMX6Q ?</P><P>How can I debug the Linux Bootloader?</P><P>Is it possible to simply change source code of the bootloader in the build-directory of the BSP and rebuild the image?</P><P></P><P>Thanks in advance,</P><P>Paul</P></BODY></HTML> Fri, 19 May 2017 07:53:13 GMT https://community.nxp.com/t5/i-MX-Processors/How-to-examine-startup-code-and-bootloader-of-linux-Yocto/m-p/686069#M106158 paulhilt 2017-05-19T07:53:13Z