Call the function argument `_disk' and construct full device paths where
needed, so that other code can reuse the mnemonic variable.

This matches install.sub's convention around ROOTDISK=sd0, ROOTDEV=sd0a and
other disk/device code.

Since it touches the installboot block, hoist it before the sysctl block
which merely assigns `_plat'.

A future diff then turns out much better.

OK?

Index: ramdisk/install.md
===================================================================
RCS file: /cvs/src/distrib/arm64/ramdisk/install.md,v
retrieving revision 1.37
diff -u -p -r1.37 install.md
--- ramdisk/install.md  25 Mar 2023 18:29:37 -0000      1.37
+++ ramdisk/install.md  25 Mar 2023 18:50:27 -0000
@@ -36,7 +36,13 @@ NCPU=$(sysctl -n hw.ncpufound)
 MOUNT_ARGS_msdos="-o-l"
 
 md_installboot() {
-       local _disk=/dev/$1 _mdec _plat
+       local _disk=$1 _mdec _plat
+
+       if ! installboot -r /mnt $_disk; then
+               echo "\nFailed to install bootblocks."
+               echo "You will not be able to boot OpenBSD from ${_disk}."
+               exit
+       fi
 
        case $(sysctl -n machdep.compatible) in
        apple,*)                _plat=apple;;
@@ -44,12 +50,6 @@ md_installboot() {
        raspberrypi,*)          _plat=rpi;
        esac
 
-       if ! installboot -r /mnt ${1}; then
-               echo "\nFailed to install bootblocks."
-               echo "You will not be able to boot OpenBSD from ${1}."
-               exit
-       fi
-
        # Apply some final tweaks on selected platforms
        _mdec=/usr/mdec/$_plat
 
@@ -65,11 +65,11 @@ md_installboot() {
                fi
                ;;
        pine64)
-               dd if=$_mdec/u-boot-sunxi-with-spl.bin of=${_disk}c \
+               dd if=$_mdec/u-boot-sunxi-with-spl.bin of=/dev/${_disk}c \
                    bs=1024 seek=8 status=none
                ;;
        rpi)
-               mount ${MOUNT_ARGS_msdos} ${_disk}i /mnt/mnt
+               mount ${MOUNT_ARGS_msdos} /dev/${_disk}i /mnt/mnt
                cp $_mdec/{bootcode.bin,start*.elf,fixup*.dat,*.dtb} /mnt/mnt/
                cp $_mdec/u-boot.bin /mnt/mnt/
                mkdir -p /mnt/mnt/overlays

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