19 Jan
2025
19 Jan
'25
2:41 p.m.
Hi Andy,
On Sunday, January 19, 2025 9:10:10 AM UTC Andy Yan wrote:
Hi Danq,
Do you have tests with this u-boot video enabled then boot a linux kernel also with drm display enabled?
Yes, I booted Linux with U-Boot VOP2 and Linux VOP2 enabled without any problem.
Because the u-boot video been enabled with no-mmu, when it runs into linux kernel with the window/plane you enable at u-boot stage, when linux kernel enable the iommu, there is a moment the window will read the memory through iommu, but the framebuffer you set in u-boot stage has not been mapped by iommu, there is a high probability of causing an IOMMU page fault.