Rework images, grouping by architectures.

Building images for Pi 3 and Pi 4 families didn't make much sense since
the same image can run on both (modulo possible CMA tweaks for the
Compute Module 4). The same is almost true for the Pi 5 (given a
sufficiently high kernel version).

Let's build:
 - for armhf (Pi 2);
 - for arm64 (Pi 3, Pi 4, Pi 5).

Let's forget about armel, it's no longer supported in Debian anyway.

Link: https://salsa.debian.org/raspi-team/image-specs/-/issues/75

generate-recipe.py

@@ -13,42 +13,26 @@ if len(sys.argv) != 3:
     print("E: need 2 arguments", file=sys.stderr)
     sys.exit(1)
 
-version = sys.argv[1]
-if version not in ["1", "2", "3", "4"]:
-    print("E: unsupported version %s" % version, file=sys.stderr)
+arch = sys.argv[1]
+if arch not in ['armhf', 'arm64']:
+    print("E: unsupported arch %s" % arch, file=sys.stderr)
     sys.exit(1)
 
 suite = sys.argv[2]
-if suite not in ['bullseye', 'bookworm', 'trixie', 'forky']:
+if suite not in ['bookworm', 'trixie', 'forky']:
     print("E: unsupported suite %s" % suite, file=sys.stderr)
     sys.exit(1)
-target_yaml = 'raspi_%s_%s.yaml' % (version, suite)
-
-
-### Detect unsupported combinations
-#
-# Some version/suite combinations are no longer supported (e.g. the architecture
-# got removed from the archive), in which case generate an empty file and let
-# the Makefile pick it up from there.
-if version == '1' and suite in ['forky']:
-    print(f'W: generating an empty recipe for unsupported combination ({version}×{suite})')
-    Path(target_yaml).write_text('')
-    sys.exit(0)
+target_yaml = 'raspi_%s_%s.yaml' % (arch, suite)
 
 
 ### Setting variables based on suite and version starts here
 
 # Arch, kernel, DTB:
-if version == '1':
-    arch = 'armel'
-    linux = 'linux-image-rpi'
-    dtb = '/usr/lib/linux-image-*-rpi/bcm*rpi-*.dtb'
-elif version == '2':
+if arch == 'armhf':
     arch = 'armhf'
     linux = 'linux-image-armmp'
     dtb = '/usr/lib/linux-image-*-armmp/bcm*rpi*.dtb'
-elif version in ['3', '4']:
-    arch = 'arm64'
+elif arch == 'arm64':
     linux = 'linux-image-arm64'
     dtb = '/usr/lib/linux-image-*-arm64/broadcom/bcm*rpi*.dtb'
 
@@ -63,16 +47,12 @@ else:
     firmware_component = 'non-free'
     firmware_component_old = ''
 
-# wireless firmware:
-if version != '2':
+# wireless/bluetooth firmware:
+if arch != 'armhf':
     wireless_firmware = 'firmware-brcm80211'
-else:
-    wireless_firmware = ''
-
-# bluetooth firmware:
-if version != '2':
     bluetooth_firmware = 'bluez-firmware'
 else:
+    wireless_firmware = ''
     bluetooth_firmware = ''
 
 # Pi 4 on buster required some backports. Let's keep variables around, ready to
@@ -81,20 +61,20 @@ backports_enable = False
 backports_suite = '%s-backports' % suite
 
 # Serial console:
-if version in ['1', '2']:
+if arch == 'armhf':
     serial = 'ttyAMA0,115200'
-elif version in ['3', '4']:
+elif arch == 'arm64':
     serial = 'ttyS1,115200'
 
 # CMA fixup:
 extra_chroot_shell_cmds = []
-if version == '4':
+if arch == 'arm64':
     extra_chroot_shell_cmds = [
         "sed -i 's/cma=64M //' /boot/firmware/cmdline.txt",
     ]
 
 # Hostname:
-hostname = 'rpi_%s' % version
+hostname = 'rpi-%s' % arch
 
 # Nothing yet!
 extra_root_shell_cmds = []