Add the apu2

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

mainboards/pcengines/apu2/Makefile

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+# This is the makefile for a flash image, a netbootable sshd image,
+# and a netbootable cpu image.
+#
+# sshdkernel produces a kernel with a built-in initramfs for netboot
+# It provides (and starts) an sshd, and also has flashrom.
+# Hence you can ssh to a node, flashrom -r on it, scp the
+# image back, process it, scp the new image to the node, and
+# write with flashrom.
+# e.g.
+# ssh -i class_key -p 2022 board flashrom -r image.bin -p internal
+# scp -i class_key -P 2022 board:/image.bin image.bin
+# make tiny.bin
+# scp -i class_key -P 2022 tiny.bin board:/tiny.bin
+# ssh -i class_key -p 2022 board flashrom -w tiny.bin -p internal
+#
+# The cpu image uses a cpud as its init, and you
+# can cpu to it to run commands, including flashrom -p internal
+# to flash the flash image.
+# e.g.
+# cpu board flashrom -r image.bin -p internal
+# Note this writes image image.bin to the host directoy; no scp needed
+# make tiny.bin
+# cpu board flashrom -w tiny.bin -p internal
+# cpu is way more convenient than ssh/scp if you can learn it.
+# you can also just
+# cpu board
+# and once you are in:
+# flashrom -r image.bin -p internal
+# make tiny.bin
+# flashrom -w tiny.bin -p internal
+# NOTE: those commands are running on the board, and they all work
+#
+# You can test the flash image kernel with qemu
+# make flashtest
+
+default: sshdkernel flashkernel cpukernel
+	echo you can add any of these targets to the apu2 image.
+	echo as img/nerf. You can also set priority.
+
+flashtest: testflashkernel
+
+usefultargets:
+	echo fetch, sshdkernel, flashkernel, cpukernel, etc.
+
+sshdkernel: sshd.cpio.lzma sshd.config
+	cp sshd.config linux/.config
+	(cd linux && make oldconfig && make -j32)
+	cp linux/arch/x86/boot/bzImage $@
+
+cpukernel: cpu.cpio.lzma cpu.config
+	cp cpu.config linux/.config
+	(cd linux && make oldconfig && make -j32)
+	cp linux/arch/x86/boot/bzImage $@
+
+readrom:
+	echo You need to get a ROM image from *somewhere*
+	echo Once you do, put it in ROM.bin
+
+writerom: image.bin
+	echo Here is where you would do the flashrom, e.g.
+	echo and maybe a cbfstool
+	echo cbfstool apu2.rom remove -n img/nerf
+	echo cbfstool apu2.rom add-payload -n img/nerf -f cpukernel
+	echo sudo flashrom -p internal -w image.bin
+
+flashinitramfs.cpio.lzma: flashinitramfs.cpio
+	lzma -f -k $<
+
+flashinitramfs.cpio: Makefile
+	go run github.com/u-root/u-root  -o $@ -build=bb \
+		-uinitcmd=/bbin/pxeboot \
+		github.com/u-root/u-root/cmds/boot/pxeboot \
+		github.com/u-root/u-root/cmds/core/cat \
+		github.com/u-root/u-root/cmds/core/elvish \
+		github.com/u-root/u-root/cmds/core/init \
+		github.com/u-root/u-root/cmds/core/ip \
+		github.com/u-root/u-root/cmds/core/ls \
+		github.com/u-root/u-root/cmds/core/kexec \
+		github.com/u-root/u-root/cmds/core/pci \
+		github.com/u-root/u-root/cmds/core/wget \
+
+# this target builds an initramfs with only one program, the cpu server.
+# It depends on the kernel setting the IP address.
+# You need ip=dhcp OR ip=fixed.ip.address.here in the command line
+cpu.cpio.lzma: Makefile
+	go run github.com/u-root/u-root -o cpu.cpio -build=bb -initcmd=cpud -files ~/.ssh/cpu_rsa.pub:key.pub \
+		-defaultsh="" \
+		github.com/u-root/cpu/cmds/cpud
+	lzma -f -k cpu.cpio
+
+# this target builds an initramfs with all of u-root, AND all of /bin, /usr/bin, /sbin, /usr/sbin, /etc
+# the intent is  to demonstrate the capability of http loading.
+# It depends on the kernel setting the IP address.
+# You need ip=dhcp OR ip=fixed.ip.address.here in the command line
+sshd.cpio.lzma:  Makefile
+	go run github.com/u-root/u-root -o sshd.cpio -build=bb \
+		-uinitcmd=/bbin/sshd \
+		-files class_key.pub:authorized_keys \
+		-files classhostkey:id_rsa \
+		-files /usr/bin/vi \
+		-files /usr/share/vim \
+		-files /usr/share/terminfo \
+		-files /bin/bash \
+		-files /usr/sbin/flashrom \
+		-files /usr/bin/xz \
+		all
+	lzma -f -k sshd.cpio
+	ls -l sshd.cpio.*
+
+flashkernel: flash.config flashinitramfs.cpio.lzma Makefile
+	cp $< linux/.config
+	(cd linux && make oldconfig && make -j32)
+	cp linux/arch/x86/boot/bzImage $@
+
+testflashkernel: flashkernel
+	qemu-system-x86_64 -kernel flashkernel -nographic -serial /dev/tty -initrd flashinitramfs.cpio.lzma
+
+testcpukernel: cpukernel
+	qemu-system-x86_64 -kernel cpukernel -nographic -serial /dev/tty
+
+# These stanzas fetch code.
+fetch: getkernel geturoot getrom
+
+getkernel:
+	rm -rf linux
+	git clone --depth=1 -b v5.7 --single-branch https://github.com/torvalds/linux
+
+getrom:
+	echo you can use flashrom to read the apu2 image.
+
+geturoot:
+	go get -u github.com/u-root/u-root
+	go get -u github.com/u-root/cpu/...
+
+# Serve the combined sshd-kernel and sshd-initramfs image. This includes flashrom
+sshd-pxeserver:
+	echo Consider Disabling any system services ...
+	echo e.g. sudo systemctl  stop tftpd-hpa.service
+	echo e.g. sudo systemctl stop isc-dhcp-server
+	sudo `go env GOPATH`/bin/pxeserver  -tftp-dir . -bootfilename sshdkernel  -http-dir . -interface $(NETWORK)
+
+# Serve the combined cpu-kernel and cpu-initramfs image.
+cpu-pxeserver:
+	echo Consider Disabling any system services ...
+	echo e.g. sudo systemctl  stop tftpd-hpa.service
+	echo e.g. sudo systemctl stop isc-dhcp-server
+	sudo `go env GOPATH`/bin/pxeserver  -tftp-dir . -bootfilename cpukernel  -http-dir . -interface $(NETWORK)
+
+ssh:
+	ssh -i class_key -p 2022 root@up

mainboards/pcengines/apu2/class_key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEA4zGICkjqlAPbYH0MZGN79zDJi88uC1pbc7cUcHQPp8R9iet0
+2Q594DiOsJhAc9ALDkVopAmDMew1OO9vwZXAkv00hPhnEHFSXJP31zaoWvQkbS/Z
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+Nze3kVUWRsXhIoG0yWh6SHbc/HKFhKymtxvdPnbP4qajfcCGIKuIA2c=
+-----END RSA PRIVATE KEY-----

mainboards/pcengines/apu2/class_key.pub

@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDjMYgKSOqUA9tgfQxkY3v3MMmLzy4LWltztxRwdA+nxH2J63TZDn3gOI6wmEBz0AsORWikCYMx7DU472/BlcCS/TSE+GcQcVJck/fXNqha9CRtL9n8aGXyBNOs+kmj6AneQIg3AzVn4gRBuOUTUSy+ApARZAwI3fZwPnYXUvRSmRFpHM8UorF8w4pgIghsUNsLWIACyO4g66eUBPLg5PUhs0GGR1fYzHaRNyFonGvLgsv40Oywi9+u0wn/mCYhYpidziZevajMPhm8KbuigSdCyFKBddOmOXUC4Qm+dpzOv6KPrrApRCHMrdSSOj31vzGGKHilWVTrrUoBt7POLK4X rminnich@xcpu

mainboards/pcengines/apu2/classhostkey

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEogIBAAKCAQEA20e7SsGzrPyXMosKhgXMbvIPSe27ilhgcWw4I1NWsPMWhYEU
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+S4Bsitze0ougzTMGLQO/9M7He/fPqjM4DIi+PvfpAl/ZUXdD/48=
+-----END RSA PRIVATE KEY-----

mainboards/pcengines/apu2/classhostkey.pub

@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDbR7tKwbOs/JcyiwqGBcxu8g9J7buKWGBxbDgjU1aw8xaFgRQOczromKoibI3e1OKKbAftZ7ArHLiikYtuTaiFi81AEAs1c2vVxXu6wBBEQAhtp+nNnqY7SBxaOt2w3fVpPMyYRc7d2RL7C0RDMoF794WOUlu60e8RCS9ha094dO0GVXLBwkRzn2itwT4c1etctw+4lkXftnkeQQw0YNa8C60eaddzcLRwp35s52GlPHsMBpYWaPUZ0vtYw8FCTWoqji4TyWo6NMHmrAIaFY+1kWAPpDBggq1n9UVYzNTK1zpyJHBvmhvr7T6ZsvcgVvVdkNs4LeBJsY9XhXTFmtW3 rminnich@xcpu