Samsung Chronos 7 keyboard has the / key as secondary for the key Q. To use the key / in the Archlinux installation it is necessary to add a mapping like <Altgr> + q.
1. Detects a keycode from the key pressed on the keyboard.
root@archiso ~ # showkey
kb mode was UNICODE
[ if you are trying this under X, it might not work
since the X server is also reading /dev/console ]
press any key (program terminates 10s after last keypress)...
keycode 28 release
keycode 16 press
keycode 16 release
2. Decompress the map file
root@archiso ~ # gunzip /usr/share/kbd/keymaps/i386/qwerty/br-abnt2.map.gz
3. Edit the file using any text editor (here is Vim)
root@archiso ~ # vi /usr/share/kbd/keymaps/i386/qwerty/br-abnt2.map
4. Add the following to the file
altgr keycode 16 = slash
5. Compress the file again
root@archiso ~ # gzip /usr/share/kbd/keymaps/i386/qwerty/br-abnt2.map
6. Load the new map file
root@archiso ~ # loadkeys br-abnt2