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Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 (patch attached)

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Package: src:linux
Version: 4.19.67-2
Severity: important
Tags: patch


Dear Maintainers,

While it is currently possible to boot and install Debian 10.x on the 
Raspberry Pi 4 using the official vanilla ARM64 ISO images (through the 
use of the latest EDK2 RPi4 firmware such as the one provided at [1]), 
one of the major drawbacks that exists is that, because the EDK2 
firmware currently only supports Linux boot in ACPI mode and also 
because the native Debian kernel does not include the bcmgenet module at 
all (module is currently disabled altogether), it is not possible to 
perform a networked installation of Debian on the Raspberry Pi 4.

Due to the popularity of the platform, we therefore suggest that 
bcmgenet should be enabled for the next Debian ARM64 10.x release as a 
matter of priority, after the the attached patch has been applied to the 
default kernel as some modifications are required for the network 
interface to work in ACPI mode in coordination with the EDK2 firmware.

With bcmgenet is currently being disabled as a module, and with the 
effort we made to ensure that the modifications applied have the least 
impact possible on existing code (the existing Device Tree code paths 
are left virtually untouched), we assert that the inclusion of this 
patch should be low risk and therefore very desirable to have for the 
potentially large number of RPi4 users, who should then be able to 
perform netinst installation of Debian 10.x on their platform using the 
vanilla ARM64 images.

Thanks and regards,

/Pete

[1] https://github.com/pftf/RPi4

-- System Information:
Debian Release: 10.2
   APT prefers stable-updates
   APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: arm64 (aarch64)

Kernel: Linux 4.19.87 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_UNSIGNED_MODULE
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_IE:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 (patch attached) Pete Batard <pete@akeo.ie> - 2020-02-03 20:10 +0100
  Bug#950578: (no subject) Pete Batard <pete@akeo.ie> - 2020-02-14 17:40 +0100
    Bug#950578: Updated patch Pete Batard <pete@akeo.ie> - 2020-02-25 12:40 +0100
      Bug#950578: (no subject) Pete Batard <pete@akeo.ie> - 2020-03-03 18:40 +0100
  Bug#950578: marked as done (linux-image-4.19.67-2-arm64: Add ACPI  network interface support for RPi4 (patch attached)) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2020-03-30 10:20 +0200
  Bug#950578: fixed in linux 5.5.13-1 Pete Batard <pete@akeo.ie> - 2020-03-30 10:50 +0200
    Bug#950578: fixed in linux 5.5.13-1 Ben Hutchings <benh@debian.org> - 2020-03-30 15:40 +0200
  Bug#950578: linux-image-5.5.0-1-armmp: enable Raspberry Pi 4 NIC module "bcmgenet" Steven Shiau <steven@nchc.org.tw> - 2020-04-06 10:30 +0200
  Bug#950578: Linux 5.5.0-1-arm64: kernel panic after module bcmgenet was loaded Steven Shiau <steven@nchc.org.tw> - 2020-04-09 05:50 +0200
    Bug#950578: Linux 5.5.0-1-arm64: kernel panic after module bcmgenet was loaded Ben Hutchings <ben@decadent.org.uk> - 2020-04-13 16:40 +0200
  Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 Pete Batard <pete@akeo.ie> - 2020-05-07 12:20 +0200
    Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 Ben Hutchings <benh@debian.org> - 2020-05-07 14:50 +0200
      Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 Pete Batard <pete@akeo.ie> - 2020-05-07 15:30 +0200
        Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 Ben Hutchings <benh@debian.org> - 2020-05-09 23:30 +0200
          Bug#950578: linux-image-4.19.67-2-arm64: Add ACPI network interface support for RPi4 Pete Batard <pete@akeo.ie> - 2020-05-10 00:40 +0200
          Difficulties with kernel package contributions Ben Hutchings <ben@decadent.org.uk> - 2020-05-17 18:00 +0200

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