On Wed, Apr 11, 2018 at 3:39 PM, Raymond Yeung rksyeung@hotmail.com wrote:
I currently have a board that uses Intel Xeon D (previously codenamed Broadwell DE). It boots up with BIOS/UEFI. I 'm exploring other oot-up options here.
I'm not familiar with this early stage of system initialization. It seems BIOS/UEFI to Linux needs to use PXE, with the need to configure DHCP (and possibly Proxy DHCP), TFTP server PXELINUX, Linux initial RAM disk (initrd) configuration file, and then Linux. Previously, I'd been using Coreboot/UBOOT environment (as a user, not developer). Prerequisite seemed much simpler.
A few questions -
- Is there even a coreboot support for this CPU already available and
stable that I could download and reflash? Or are we talking about some serious re-development?
Yes - See src/mainboard/intel/camelbackmountain_fsp/ for the reference platform.
You'll need the Intel FSP blob from https://github.com/IntelFsp/FSP/tree/Broadwell-DE. You'll also need microcode which you can download from developer.intel.com.
- Is it possible to go from BIOS/UEFI to UBOOT (on-board)? How?
I haven't tried uboot as a payload, but yes, it is possible. There are other options available to consider depending on your use case.
- Support for Secure Boot - would one approach be simpler than
another?
It depends on what you want/need. Philipp Deppenwiese is working on "vboot" (Google's verified boot implementation) integration with upstream: https://review.coreboot.org/#/c/coreboot/+/24993/
More about that approach here: https://www.chromium.org/chromium-os/chromiumos-design-docs/verified-boot
- Am I even on the right track thinking this way?
You seem to be off to a good start :-)
-
David Hendricks