mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 11:13:07 +00:00
54 lines
1.4 KiB
Text
54 lines
1.4 KiB
Text
|
NAND Flash
|
||
|
|
----------
|
||
|
|
|
||
|
|
(there isn't yet a generic binding in Linux, so this describes what is in
|
||
|
|
U-Boot. There should not be Linux-specific or U-Boot specific binding, just
|
||
|
|
a binding that describes this hardware. But agreeing a binding in Linux in
|
||
|
|
the absence of a driver may be beyond my powers.)
|
||
|
|
|
||
|
|
The device node for a NAND flash device is as follows:
|
||
|
|
|
||
|
|
Required properties :
|
||
|
|
- compatible : Should be "manufacturer,device", "nand-flash"
|
||
|
|
|
||
|
|
This node should sit inside its controller.
|
||
|
|
|
||
|
|
|
||
|
|
Nvidia NAND Controller
|
||
|
|
----------------------
|
||
|
|
|
||
|
|
The device node for a NAND flash controller is as follows:
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
|
||
|
|
nvidia,wp-gpios : GPIO of write-protect line, three cells in the format:
|
||
|
|
phandle, parameter, flags
|
||
|
|
nvidia,nand-width : bus width of the NAND device in bits
|
||
|
|
|
||
|
|
- nvidia,nand-timing : Timing parameters for the NAND. Each is in ns.
|
||
|
|
Order is: MAX_TRP_TREA, TWB, Max(tCS, tCH, tALS, tALH),
|
||
|
|
TWHR, Max(tCS, tCH, tALS, tALH), TWH, TWP, TRH, TADL
|
||
|
|
|
||
|
|
MAX_TRP_TREA is:
|
||
|
|
non-EDO mode: Max(tRP, tREA) + 6ns
|
||
|
|
EDO mode: tRP timing
|
||
|
|
|
||
|
|
The 'reg' property should provide the chip select used by the flash chip.
|
||
|
|
|
||
|
|
|
||
|
|
Example
|
||
|
|
-------
|
||
|
|
|
||
|
|
nand-controller@0x70008000 {
|
||
|
|
compatible = "nvidia,tegra20-nand";
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
nvidia,wp-gpios = <&gpio 59 0>; /* PH3 */
|
||
|
|
nvidia,nand-width = <8>;
|
||
|
|
nvidia,timing = <26 100 20 80 20 10 12 10 70>;
|
||
|
|
nand@0 {
|
||
|
|
reg = <0>;
|
||
|
|
compatible = "hynix,hy27uf4g2b", "nand-flash";
|
||
|
|
};
|
||
|
|
};
|