绝大多数的SoC目前都支持和使用CMA技术,并且多数情况下,DMA coherent APIs以CMA区域为申请的后端,这个时候,dma alloc coherent本质上用__alloc_from_contiguous()从CMA区域获取内存,申请出来的内存显然是物理连续的。这一点,在设备树dts里面就可以轻松配置,要么配置一个自己特定的cma区域,要么从“linux,cma-default”...
绝大多数的SoC目前都支持和使用CMA技术,并且多数情况下,DMA coherent APIs以CMA区域为申请的后端,这个时候,dma alloc coherent本质上用__alloc_from_contiguous()从CMA区域获取内存,申请出来的内存显然是物理连续的。这一点,在设备树dts里面就可以轻松配置,要么配置一个自己特定的cma区域,要么从“linux,cma-default”...
Please try to add bootargs "cma = 256M". The consistent DMA mapping interfaces, for non-NULL dev, will by default return a DMA address which is 32-bit addressable. Even if the device indicates (via DMA mask) that it may address the upper 32-bits, consistent allocation will only ...
centos内核升级有什么用呢，主要是支持新硬件，解决bug，提升效率，支持新功能，面向网络、开发、服务应用...
绝大多数的SoC目前都支持和使用CMA技术,并且多数情况下,DMA coherent APIs以CMA区域为申请的后端,这个时候,dma alloc coherent本质上用__alloc_from_contiguous()从CMA区域获取内存,申请出来的内存显然是物理连续的。这一点,在设备树dts里面就可以轻松配置,要么配置一个自己特定的cma区域,要么从“linux,cma-default”...
linux,cma { compatible = "shared-dma-pool"; reusable; size = <0x4000000>; alignment = <0x2000>; linux,cma-default; }; display_reserved: framebuffer@78000000 { reg = <0x78000000 0x800000>; }; multimedia_reserved: multimedia@77000000 { ...
Please try to add bootargs "cma = 256M". The consistent DMA mapping interfaces, for non-NULL dev, will by default return a DMA address which is 32-bit addressable. Even if the device indicates (via DMA mask) that it may address the upper 32-bits, consistent allocation will only ...
Please try to add bootargs "cma = 256M". The consistent DMA mapping interfaces, for non-NULL dev, will by default return a DMA address which is 32-bit addressable. Even if the device indicates (via DMA mask) that it may address the upper 32-bits, consistent allocation...
Please try to add bootargs "cma = 256M". The consistent DMA mapping interfaces, for non-NULL dev, will by default return a DMA address which is 32-bit addressable. Even if the device indicates (via DMA mask) that it may address the upper 32-bits, consistent allocation will only ...
Please try to add bootargs "cma = 256M". The consistent DMA mapping interfaces, for non-NULL dev, will by default return a DMA address which is 32-bit addressable. Even if the device indicates (via DMA mask) that it may address the upper 32-bits, consistent allocation will only return...