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appendixj.ms: gently update for arm64

--- a/appendixj.ms

+++ b/appendixj.ms

@@ -47,12 +47,12 @@

 .R

 The last release introduces support for

-raspi1,2 and 3 and you can build a sdcard image that will

+raspi1, 2, 3, and 4, and you can build a sdcard image that will

 be bootable on raspi by running:

 .P1

 # build arm userspace

 cd /sys/src

-objtype=arm

+objtype=arm	# arm64 for rpi3 or rpi4

 mk install

 # download raspi firmware

@@ -59,12 +59,17 @@

 cd /sys/src/boot/bcm

 mk

-# build 32 bit arm kernel for raspi (pi2 also works for raspi3)

+# build 32-bit kernel for rpi1 or rpi2 (pi2 also works for raspi3)

 cd /sys/src/9/bcm

 mk 'CONF=pi' install

 mk 'CONF=pi2' install

-# build bootable hjfs sdcard image for raspi

+# build a 64-bit kernel for rpi3 or rpi4

+cd /sys/src/9/bcm64

+mk 'CONF=pi3' install

+mk 'CONF=pi4' install

+

+# build bootable hjfs sdcard image for rpi

 cd /sys/lib/dist

 bind / /n/src9

 mk /path/to/somethingsomething.pi.img