Messages in this thread | | | From | Rob Herring <> | Date | Tue, 15 Dec 2020 14:27:09 -0600 | Subject | Re: [PATCH 3/6] ARM: dts: bcm2711: Add reserved memory template to hold firmware configuration |
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On Tue, Dec 15, 2020 at 9:56 AM Nicolas Saenz Julienne <nsaenzjulienne@suse.de> wrote: > > RPi4's co-processor will copy the board's bootloader configuration into > memory for the OS to consume. Introduce a reserved-memory area template > for the co-processor to edit before booting the system so as for Linux > not to overwrite that memory. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > --- > arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts > index 403bacf986eb..c58e58e8ce39 100644 > --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts > +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts > @@ -25,6 +25,7 @@ aliases { > emmc2bus = &emmc2bus; > ethernet0 = &genet; > pcie0 = &pcie0; > + eeprom = &eeprom;
I don't see the need for this...
> }; > > leds { > @@ -218,6 +219,19 @@ &pwm1 { > status = "okay"; > }; > > +&rmem { > + /* > + * RPi4's co-processor will copy the board's bootloader configuration > + * into memory for the OS to consume. It'll also update this node with > + * its placement information. > + */ > + eeprom: eeprom@0 {
But it's not an eeprom. It's just memory with some format to the contents.
> + reg = <0x0 0x0 0x0>; > + no-map; > + status = "disabled"; > + }; > +}; > + > /* SDHCI is used to control the SDIO for wireless */ > &sdhci { > #address-cells = <1>; > -- > 2.29.2 >
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