Re: [PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap

Hi Christoph Hellwig, This is the patchset. for your reference. thanks, On Mon, Jun 8, 2020 at 4:30 PM wrote: > > From: dillon min > > To mmap a framebuffer or v4l2 buffer from kernel to userspace on > no-mmu platform, we need rely on 'arm_nommu_dma_ops' from > arch/arm/mm/dma-mapping-nommu.c

[PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap

From: dillon min To mmap a framebuffer or v4l2 buffer from kernel to userspace on no-mmu platform, we need rely on 'arm_nommu_dma_ops' from arch/arm/mm/dma-mapping-nommu.c , so setup 4M bytes memory reserved for this purpose. Signed-off-by: dillon min --- arch/arm/boot/dts/stm32f469-disco.dts