images: Add am335x-evm support.

* gnu/system/images/am335x-evm.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Change-Id: Ic3695d9d26a4870500a9bf1b2a3d53d93fed6db6
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
Signed-off-by: Vagrant Cascadian <vagrant@debian.org>

gnu/system/images/am335x-evm.scm

@@ -0,0 +1,84 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 Marius Bakke <marius@gnu.org>
+;;; Copyright © 2025 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu system images am335x-evm)
+  #:use-module (gnu bootloader u-boot)
+  #:use-module (gnu bootloader)
+  #:use-module (gnu image)
+  #:use-module (gnu packages bootloaders)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu services base)
+  #:use-module (gnu services networking)
+  #:use-module (gnu services)
+  #:use-module (gnu system file-systems)
+  #:use-module (gnu system image)
+  #:use-module (gnu system)
+  #:use-module (guix platforms arm)
+  #:use-module (srfi srfi-26)
+  #:export (am335x-evm-barebones-os
+            am335x-evm-image-type
+            am335x-evm-barebones-raw-image))
+
+;; See the comment in u-boot-am335x-evm-bootloader to know which computers are
+;; supported by this image.
+(define am335x-evm-barebones-os
+  (operating-system
+    (host-name "guadalajara")
+    (timezone "Europe/Madrid")
+    (locale "en_US.utf8")
+    (bootloader (bootloader-configuration
+                 (bootloader u-boot-am335x-evm-bootloader)
+                 (targets '("/dev/sda"))))
+    (initrd-modules '())
+    (kernel linux-libre-arm-generic)
+    (file-systems (cons (file-system
+                          (device (file-system-label "my-root"))
+                          (mount-point "/")
+                          (type "ext4"))
+                        %base-file-systems))
+    (services (append (list
+                       (service
+                        agetty-service-type
+                        (agetty-configuration
+                          (extra-options '("-L")) ;no carrier detect
+                          (baud-rate "115200")
+                          (term "vt100")
+                          (tty "ttyS0")))
+                       (service dhcpcd-service-type))
+                      %base-services))))
+
+(define am335x-evm-image-type
+  (image-type
+    (name 'am335x-evm-raw)
+    (constructor (lambda (os)
+                   (image
+                     ;; Reserve 4 MiB for the partition table and the
+                     ;; bootloader.
+                     (inherit (raw-with-offset-disk-image (expt 2 22)))
+                     (operating-system os)
+                     (platform armv7-linux))))))
+
+(define am335x-evm-barebones-raw-image
+  (image
+   (inherit
+    (os+platform->image am335x-evm-barebones-os armv7-linux
+                        #:type am335x-evm-image-type))
+   (name 'am335x-evm-barebones-raw-image)))
+
+am335x-evm-barebones-raw-image