| Message ID | 20201215155627.2513-4-nsaenzjulienne@suse.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Expose RPi4'd bootloader configuration | expand |
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 >
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; }; 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 { + reg = <0x0 0x0 0x0>; + no-map; + status = "disabled"; + }; +}; + /* SDHCI is used to control the SDIO for wireless */ &sdhci { #address-cells = <1>;
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(+)