Hi Mike,
On 19.2.2020 14.20, Mike Looijmans wrote:
Add bootmode override support for ZynqMP devices. Allows one to select
a boot device by running "reboot qspi32" for example. Activate config
item CONFIG_SYSCON_REBOOT_MODE to make this work.
Signed-off-by: Mike Looijmans <mike.looijmans@xxxxxxxx>
---
arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
index 26d926eb1431..4c38d77ecbba 100644
--- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
+++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
@@ -246,6 +246,30 @@
};
};
+ /* Clock and Reset control registers for LPD */
+ lpd_apb: apb@ff5e0000 {
+ compatible = "syscon", "simple-mfd";
+ reg = <0x0 0xff5e0000 0x0 0x400>;
+ reboot-mode {
+ compatible = "syscon-reboot-mode";
+ offset = <0x200>;
+ mask = <0xf100>;
+ /* Bit(8) is the "force user" bit */
+ mode-normal = <0x0000>;
+ mode-psjtag = <0x0100>;
+ mode-qspi24 = <0x1100>;
+ mode-qspi32 = <0x2100>;
+ mode-sd0 = <0x3100>;
+ mode-nand = <0x4100>;
+ mode-sd1 = <0x6100>;
+ mode-emmc = <0x6100>;
+ mode-usb0 = <0x7100>;
+ mode-pjtag0 = <0x8100>;
+ mode-pjtag1 = <0x9100>;
+ mode-sd1ls = <0xe100>;
This kinda looks a bit misuse of reboot mode support.
Usually you are signal with reboot-mode that you want to do factory
reset, enter recovery mode or such things.
Now this signaling here is telling that this is used for selecting from
what device to boot from.
Another problem is that this now modifies all Xilinx Zynq MPSoCs which
is kinda wrong. This behavior should really be product/board specific
and not common for all boards -- undoing this in product/board is
somewhat cumbersome. Now this change hijacks the "reboot <arg>" with
this behavior which is not so nice.
Thanks,
Vesa Jääskeläinen
