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dist/mkfile: add target for the aijuboard *.zynq.img

this generates a disk image (to be written to usb or
sdmmc card) containing 9fat partition with kernel and
a hjfs filesystem partition with the 9front distribution.

this could be easily extended to generate raspberry pi
images as well, but i have no hardware to test.

--- a/sys/lib/dist/mkfile

+++ b/sys/lib/dist/mkfile

@@ -2,10 +2,8 @@

 iso=/tmp/9front.iso

 cd:V:	$iso

-	

-%.iso:  $proto

-	@{rfork n

+binds:V:

 	bind cfg /n/src9/cfg

 	bind mail/lib /n/src9/mail/lib

 	bind ndb /n/src9/lib/ndb

@@ -12,5 +10,53 @@

 	bind -a adm/timezone /n/src9/adm/timezone

 	bind usr /n/src9/usr

 	bind /n/src9 /n/src9/dist/plan9front

+

+%.iso:  $proto

+	@{rfork n

+	mk binds

 	disk/mk9660 -c9j -B 386/9bootiso -E 386/efiboot.fat -p $proto -s /n/src9 -v 'Plan 9 Front' $target

+	}

+

+%.zynq.img:

+	@{

+	objtype=arm

+	kernel=/n/src9/$objtype/9zynq

+	echo 'bootfile='^`{basename $kernel} > /env/plan9.ini

+	fatfiles=(/env/plan9.ini $kernel)

+	mb=1919	# storage vendors idea of 2GB

+	mk $target.$pid.disk

+	mv $target.$pid.disk $target

+	}

+

+%.disk:D:	$proto $fatfiles

+	@{rfork n

+	mk binds

+	rm -f $target

+	dd -if /dev/zero -of $target -bs 1048576 -oseek $mb -count 1

+	s=`{basename $target}

+	disk/partfs -m /n/$s $target

+	d=/n/$s/sdXX

+	disk/mbr $d/data

+	disk/fdisk -baw $d/data

+	disk/prep -bw -a^(9fat nvram fs) $d/plan9

+	disk/format -d -r 2 $d/9fat $fatfiles

+	hjfs -f $d/fs -n $s -S -r

+	{

+		echo echo on

+		echo create /dist sys sys 775 d

+		echo create /usr sys sys 775 d

+		user=glenda

+		echo newuser $user

+		echo newuser adm +$user

+		echo newuser sys +$user

+		echo newuser upas +$user

+		echo echo off

+		sleep 1

+	} >> /srv/$s.cmd

+	mount -N -c /srv/$s /n/newfs

+	disk/mkfs -z 4096 -U -s /n/src9 -d /n/newfs $proto

+	echo sync >> /srv/$s.cmd

+	echo halt >> /srv/$s.cmd

+	while(test -e /srv/$s.cmd) sleep 1

+	exit ''

 	}