On Fri, Dec 02, 2022 at 05:17:59PM +0100, Marek Vasut wrote:
On 12/2/22 16:49, Miquel Raynal wrote:
, not the NAND controller node. I hope this is correctly supported in U-Boot though. So if there is a NAND chip subnode, I suppose U-Boot would try to create the partitions that are inside, or even in the sub "partitions" container.
My understanding is that U-Boot checks the nand-controller node size-cells, not the nand-chip{} or partitions{} subnode size-cells .
Not 100% correct.
- U-Boot before v2022.04 updates the nand-controller{} node, no matter what. - U-Boot starting from v2022.04 looks for `partitions{}` into the nand-controller{} node, and creates the partition into it if found. If not found it behaves the same way as the previous versions. See commit 36fee2f7621e ("common: fdt_support: add support for "partitions" subnode to fdt_fixup_mtdparts()")
I'd like to stress once more the fact that we cannot expect old U-Boot to be updated in the field, and they will keep generating the partitions as child of the nand-controller node whatever we do with the dts file.
I think that this should be treated the same way as any other fixup we might have for broken firmware, especially considering that this used to "work" (yes, I can agree that it horrible, but I cannot change the past) without even a warning since the imx7 support was first introduced in the linux kernel years ago.
Francesco, can you please share the DT, including the U-Boot generated partitions, which is passed to Linux on Colibri MX7 ? I think that should make all confusion go away.
The device tree part is easy, just arch/arm/boot/dts/imx7d-colibri-eval-v3.dts.
and the nand-controller node is coming from
#include "imx7d.dtsi"
plus
&gpmi { fsl,use-minimum-ecc; nand-ecc-mode = "hw"; nand-on-flash-bbt; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_gpmi_nand>; };
The partitions nodes are generated 100% by U-Boot, nothing is present in the dts source files.
With this DTS file as input, whatever U-Boot version is used I have the following generated:
root@colibri-imx7-02844233:/# ls /proc/device-tree/soc/nand-controller@33002000/ #address-cells dma-names nand-on-flash-bbt pinctrl-0 #size-cells dmas partition@0 pinctrl-names assigned-clock-parents fsl,use-minimum-ecc partition@200000 reg assigned-clocks interrupt-names partition@380000 reg-names clock-names interrupts partition@400000 status clocks name partition@80000 compatible nand-ecc-mode phandle
root@colibri-imx7-02844233:/# ls /proc/device-tree/soc/nand-controller@33002000/partition@* /proc/device-tree/soc/nand-controller@33002000/partition@0: label name reg
/proc/device-tree/soc/nand-controller@33002000/partition@200000: label name read_only reg
/proc/device-tree/soc/nand-controller@33002000/partition@380000: label name reg
/proc/device-tree/soc/nand-controller@33002000/partition@400000: label name reg
/proc/device-tree/soc/nand-controller@33002000/partition@80000: label name read_only reg