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- External Memory Interface
- -------------------------
- The emifa node describes a simple external bus controller found on some C6X
- SoCs. This interface provides external busses with a number of chip selects.
- Required properties:
- - compatible: must be "ti,c64x+emifa", "simple-bus"
- - reg: register area base and size
- - #address-cells: must be 2 (chip-select + offset)
- - #size-cells: must be 1
- - ranges: mapping from EMIFA space to parent space
- Optional properties:
- - ti,dscr-dev-enable: Device ID if EMIF is enabled/disabled from DSCR
- - ti,emifa-burst-priority:
- Number of memory transfers after which the EMIF will elevate the priority
- of the oldest command in the command FIFO. Setting this field to 255
- disables this feature, thereby allowing old commands to stay in the FIFO
- indefinitely.
- - ti,emifa-ce-config:
- Configuration values for each of the supported chip selects.
- Example:
- emifa@70000000 {
- compatible = "ti,c64x+emifa", "simple-bus";
- #address-cells = <2>;
- #size-cells = <1>;
- reg = <0x70000000 0x100>;
- ranges = <0x2 0x0 0xa0000000 0x00000008
- 0x3 0x0 0xb0000000 0x00400000
- 0x4 0x0 0xc0000000 0x10000000
- 0x5 0x0 0xD0000000 0x10000000>;
- ti,dscr-dev-enable = <13>;
- ti,emifa-burst-priority = <255>;
- ti,emifa-ce-config = <0x00240120
- 0x00240120
- 0x00240122
- 0x00240122>;
- flash@3,0 {
- #address-cells = <1>;
- #size-cells = <1>;
- compatible = "cfi-flash";
- reg = <0x3 0x0 0x400000>;
- bank-width = <1>;
- device-width = <1>;
- partition@0 {
- reg = <0x0 0x400000>;
- label = "NOR";
- };
- };
- };
- This shows a flash chip attached to chip select 3.
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