1、reserved memory 主要是为了静态分配一块内存作为了预留; 2、属性值配置: - compatible: 配置成: "rockchip,stb-devinfo" - reg: 内存块定义 3、以rk3399为例: Example: --- /* RK3399 */ reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; ... stb_devinfo: stb-devi...
有时设备驱动程序需要采用 DMA 的方式使用预留的内存,对于这种场景,可以将 dts 中的节点属性设置为 shared-dma-pool,从而生成为特定设备驱动预留的 DMA 内存池,此时驱动可通过 DMA API 来使用预留内存。 memory 对应设备树节点: / { #address-cells =<1>; #size-cells =<1>; memory { reg = <0x800000000x...
二者在dtc编译时中处理的方法不同, reserved-memory做为device tree node解析到device-tree structure中; memreserve最终会加到dtb文件的memory reserve map, 见下图 区别2 二者在内核中的处理方式不同 1、 memreserve处理流程 start_kernel - init/main.c->setup_arch - arch/arm/kernel/setup.c->arm_memblock...
reserved memory 英 [r??z?:vd ?mem?ri] 美 [r??z?:vd ?m?m?ri]n.保留内存 reserved 英 [r??z?:vd] 美 [r??z?:rvd]adj.预订的； 矜持的； 储藏着的 v.保留[储备]某物（ reserve的过去式）派生词：reservedly reservedness memory 英 [?mem?ri] 美 [?m?m?ri]n.记忆，记...
用于64位Cortex-A53 MPSoC的system-top.dts文件中的设备树节点: reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; reserved: buffer@0 { no-map; reg = <0x0 0x70000000 0x0 0x10000000>; }; }; reserved-driver@0 { ...
读取dts文件的文件为:drivers/pinctrl/freescale/pinctrl-imx.c,实现函数名为:static int imx_pinctrl_parse_groups(。。。),如下: 1. static int imx_pinctrl_parse_groups(struct device_node *np, 2. struct imx_pin_group *grp, 3. struct imx_pinctrl_soc_info *info, ...
I set the reserved memory in the dts. I only reserved dozens of megabytes of memory, but the kernel log shows that more than 200 megabytes of memory are reserved, imx8x. Is there any other place besides the dts set the reserved memory...
修改设备树文件(system-user.dtsi),在启动参数 bootargs 中增加 “uio_pdrv_genirq.of_id=generic-uio”。 / { chosen { bootargs = " earlycon console=ttyPS0,115200 clk_ignore_unused root=/dev/mmcblk0p2 rw rootwait uio_pdrv_genirq.of_id=generic-uio"; }; } 使用uio_pdrv_genirq.of_id=...
/include/ "system-conf.dtsi" / { reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; buffer@0x30000000 { no-map; reg = <0 0x30000000 0 0x10000000>; }; }; } 按照上述方式修改设备树并编译内核,系统启动后通过命令 cat /proc/iomem 即可查看系统的内存分配: cat ...
Hi, I want to add reserved-memory in dts on imx7. Would you show me? Solved! Go to Solution. Labels: i.MX7Dual Tags: dts imx7 reserved-memory 0 Kudos Reply 1 Solution 11-19-2020 08:54 PM 2,862 Views joanxie NXP TechSupport yes, if you need to change the memor...