According to the patched grub code and process of generating bios image. You can regenerate the spi image by manually. I guess you want to get a tool to flash SPI image directly from console, right? As I known, Intel has no this kind of tool in current phase.
HI Jacker.Wang I am not worried about flashing the image. I want to build a GRUB2 image instead of the Clanton GRUB image that is already included in the SPI Flash. But, I want to first try chainloading GRUB2 without modifying the SPI flash, but I have not been able to do so yet.
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Jacker.Wang there are a couple of supported ways to flash the SPI image from a running system: search for the word "capsule" in the BSP build guide.