linux-firmware: replace machine override with new recipes

Raspberry Pi hardware requires firmware that supersedes or is not
present in the standard linux-firmware distribution.  These files are
maintained in the RPi-Distro project on github.

Several attempts have been made to reconcile conflicts between what's in
linux-firmware and what the hardware needs.  The existing approach is
functional but not maintainable since it combines material from three
repositories into a single package that claims to be linux-firmware.

Remove the appends that change the content of linux-firmware for rpi
hardware.  Add two new recipes that follow the RPi-Distro repositories:

* firmware-nonfree which forked from linux-firmware and replaces
  content is provided as linux-firmware-rpidistro;
* bluez-firmware which forked from (very old) bluez and adds content is
  provided as bluez-firmware-rpidistro.

The packages are named to make clear that these come from RPi-Distro,
rather than generic sources.  Licensing attempts to record the state of
licensing as documented in RPi-Distro.

Resolves: #298
Signed-off-by: Peter A. Bigot <pab@pabigot.com>

recipes-kernel/linux-firmware-rpidistro/linux-firmware-rpidistro_git.bb

@@ -0,0 +1,96 @@
+SUMMARY = "Linux kernel firmware files from Raspbian distribution"
+DESCRIPTION = "Updated firmware files for RaspberryPi hardware. \
+RPi-Distro obtains these directly from Cypress; they are not submitted \
+to linux-firmware for general use."
+HOMEPAGE = "https://github.com/RPi-Distro/firmware-nonfree"
+SECTION = "kernel"
+
+# In maintained upstream linux-firmware:
+# * brcmfmac43430-sdio falls under LICENCE.cypress
+# * brcmfmac43455-sdio falls under LICENCE.broadcom_bcm43xx
+#
+# It is likely[^1] that both of these should be under LICENCE.cypress.
+# Further, at this time the text of LICENCE.broadcom_bcm43xx is the same
+# in linux-firmware and RPi-Distro/firmware-nonfree, but this may
+# change.
+#
+# Rather than make assumptions about what's supposed to be what, we'll
+# use the license implied by the source of these files, named to avoid
+# conflicts with linux-firmware.
+#
+# [^1]: https://github.com/RPi-Distro/bluez-firmware/issues/1
+LICENSE = "\
+    Firmware-broadcom_bcm43xx-rpidistro \
+    & WHENCE \
+"
+LIC_FILES_CHKSUM = "\
+    file://LICENCE.broadcom_bcm43xx;md5=3160c14df7228891b868060e1951dfbc \
+    file://WHENCE;md5=a9c2c217f513c20e1d16b384b3e2c12d \
+"
+
+# These are not common licenses, set NO_GENERIC_LICENSE for them
+# so that the license files will be copied from fetched source
+NO_GENERIC_LICENSE[Firmware-broadcom_bcm43xx-rpidistro] = "LICENCE.broadcom_bcm43xx"
+NO_GENERIC_LICENSE[WHENCE] = "WHENCE"
+
+SRC_URI = "git://github.com/RPi-Distro/firmware-nonfree"
+SRCREV = "b518de45ced519e8f7a499f4778100173402ae43"
+PV = "0.0+git${SRCPV}"
+
+S = "${WORKDIR}/git"
+
+inherit allarch
+
+CLEANBROKEN = "1"
+
+do_compile() {
+    :
+}
+
+do_install() {
+    install -d ${D}${nonarch_base_libdir}/firmware/brcm
+
+    cp ./LICENCE.broadcom_bcm43xx ${D}${nonarch_base_libdir}/firmware/LICENCE.broadcom_bcm43xx-rpidistro
+
+    # Replace outdated linux-firmware files with updated ones from
+    # raspbian firmware-nonfree. Raspbian adds blobs and nvram
+    # definitions that are also necessary so copy those too.
+    for fw in brcmfmac43430-sdio brcmfmac43455-sdio ; do
+        install -m 0644 brcm/${fw}.* ${D}${nonarch_base_libdir}/firmware/brcm/
+    done
+}
+
+PACKAGES = "\
+    ${PN}-broadcom-license \
+    ${PN}-bcm43430 \
+    ${PN}-bcm43455 \
+"
+
+LICENSE_${PN}-bcm43430 = "Firmware-broadcom_bcm43xx-rpidistro"
+LICENSE_${PN}-bcm43455 = "Firmware-broadcom_bcm43xx-rpidistro"
+LICENSE_${PN}-broadcom-license = "Firmware-broadcom_bcm43xx-rpidistro"
+FILES_${PN}-broadcom-license = "${nonarch_base_libdir}/firmware/LICENCE.broadcom_bcm43xx-rpidistro"
+FILES_${PN}-bcm43430 = "${nonarch_base_libdir}/firmware/brcm/brcmfmac43430*"
+FILES_${PN}-bcm43455 = "${nonarch_base_libdir}/firmware/brcm/brcmfmac43455*"
+RDEPENDS_${PN}-bcm43430 += "${PN}-broadcom-license"
+RDEPENDS_${PN}-bcm43455 += "${PN}-broadcom-license"
+RCONFLICTS_${PN}-bcm43430 = "\
+    linux-firmware-bcm43430 \
+    linux-firmware-raspbian-bcm43430 \
+"
+RREPLACES_${PN}-bcm43430 = "\
+    linux-firmware-bcm43430 \
+    linux-firmware-raspbian-bcm43430 \
+"
+RCONFLICTS_${PN}-bcm43455 = "\
+    linux-firmware-bcm43455 \
+    linux-firmware-raspbian-bcm43455 \
+"
+RREPLACES_${PN}-bcm43455 = "\
+    linux-firmware-bcm43455 \
+    linux-firmware-raspbian-bcm43455 \
+"
+
+# Firmware files are generally not run on the CPU, so they can be
+# allarch despite being architecture specific
+INSANE_SKIP = "arch"