On Fri, 21 Apr 2023 at 08:55, Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> wrote: > > On 20/04/2023 14:29, Ivan T. Ivanov wrote: > > From: Tim Gover <tim.gover@xxxxxxxxxxxxxxx> > > > > Make a copy of the bootloader secure-boot public key available to the OS > > via an nvmem node. The placement information is populated by the > > Raspberry Pi firmware[1] if a public key is present in the BCM2711 > > bootloader EEPROM. > > > > [1] https://www.raspberrypi.com/documentation/computers/configuration.html#nvmem-nodes > > > > Signed-off-by: Tim Gover <tim.gover@xxxxxxxxxxxxxxx> > > [iivanov] Added link to documentation. > > Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxx> > > --- > > arch/arm/boot/dts/bcm2711-rpi.dtsi | 14 ++++++++++++++ > > 1 file changed, 14 insertions(+) > > > > diff --git a/arch/arm/boot/dts/bcm2711-rpi.dtsi b/arch/arm/boot/dts/bcm2711-rpi.dtsi > > index 98817a6675b9..e30fbe84f9c3 100644 > > --- a/arch/arm/boot/dts/bcm2711-rpi.dtsi > > +++ b/arch/arm/boot/dts/bcm2711-rpi.dtsi > > @@ -15,6 +15,7 @@ aliases { > > ethernet0 = &genet; > > pcie0 = &pcie0; > > blconfig = &blconfig; > > + blpubkey = &blpubkey; > > }; > > }; > > > > @@ -67,6 +68,19 @@ blconfig: nvram@0 { > > no-map; > > status = "disabled"; > > }; > > + > > + /* > > + * RPi4 will copy the binary public key blob (if present) from the bootloader > > + * into memory for use by the OS. > > + */ > > + blpubkey: nvram@1 { > > + compatible = "raspberrypi,bootloader-public-key", "nvmem-rmem"; > > + #address-cells = <1>; > > + #size-cells = <1>; > > + reg = <0x0 0x0 0x0>; > > + no-map; > > + status = "disabled"; > > Why this is disabled? What external resources are missing? > > Best regards, > Krzysztof These nodes default to disabled because the firmware will not populate them if the public-key or configuration file are not present. e.g. There's no requirement to have a bootloader EEPROM on BCM2711. Tim
