This was submitted upstream
https://github.com/openbios/openbios/pull/12

diff --git a/config/scripts/switch-arch b/config/scripts/switch-arch
index b5acc6c..a96ef4b 100755
--- a/config/scripts/switch-arch
+++ b/config/scripts/switch-arch
@@ -38,7 +38,8 @@ longbits()
     if test "$cpu" = "sparc64" -o "$cpu" = "ia64" \
         -o "$cpu" = "amd64" -o "$cpu" = "x86_64" \
         -o "$cpu" = "powerpc64" -o "$cpu" = "ppc64" \
-        -o "$cpu" = "ppc64le" -o "$cpu" = "alpha" ; then
+        -o "$cpu" = "ppc64le" -o "$cpu" = "alpha" \
+        -o "$cpu" = "aarch64" -o "$cpu" = "riscv64" ; then
         echo 64
     else
         echo 32
ba5b56f50da22534157'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=10612d61540228d48c998ba5b56f50da22534157'>root</a>/<a href='/guix/log/gnu?id=10612d61540228d48c998ba5b56f50da22534157'>gnu</a>/<a href='/guix/log/gnu/packages?id=10612d61540228d48c998ba5b56f50da22534157'>packages</a>/<a href='/guix/log/gnu/packages/rdesktop.scm?id=10612d61540228d48c998ba5b56f50da22534157'>rdesktop.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/rdesktop.scm?id=10612d61540228d48c998ba5b56f50da22534157&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-11-19 20:48:26 +0200'>2020-11-19</span></td><td><a href='/guix/commit/gnu/packages/rdesktop.scm?id=8ed4c468ab611409902c00bdf7c21fdb8d312928'>gnu: Don't append '.git' to GitHub uris.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/admin.scm (nmrpflash)[source]: Remove '.git' from URI.
* gnu/packages/aidc.scm (zxing-cpp),
* gnu/packages/assembly.scm (mbuild),
* gnu/packages/audio.scm (opensles, wildmidi, tinyalsa),
* gnu/packages/browser-extensions.scm (ublock-origin-chromium),
* gnu/packages/check.scm (mutest),
* gnu/packages/compression.scm (unshield),
* gnu/packages/coq.scm (subset),
* gnu/packages/dictionaries.scm (translate-shell),
* gnu/packages/disk.scm (memkind),
* gnu/packages/documentation.scm (latex2html),
* gnu/packages/emacs-xyz.scm (emacs-chronometrist,
  emacs-flycheck-ledger, emacs-counsel-notmuch, emacs-spaceline,
  emacs-org-generate),
* gnu/packages/embedded.scm (ebusd, ebusd-configuration),
* gnu/packages/enchant.scm (nuspell),
* gnu/packages/fontutils.scm (woff2),
* gnu/packages/geo.scm (memphis),
* gnu/packages/gimp.scm (mrg),
* gnu/packages/gnome-xyz.scm (gnome-shell-extension-appindicator),
* gnu/packages/gnome.scm (parlatype),
* gnu/packages/golang.scm (go-github-com-tv42-httpunix,
  go-github-com-ayufan-golang-kardianos-service),
* gnu/packages/graphics.scm (eglexternalplatform, egl-wayland, mmm,
  directfb, flux),
* gnu/packages/gstreamer.scm (openni2, ccextractor, libvisual,
  graphene),
* gnu/packages/guile-xyz.scm (guile-srfi-180, guile-torrent),
* gnu/packages/image.scm (openjpeg-data),
* gnu/packages/java.scm (javacc),
* gnu/packages/language.scm (liblouis, liblouisutdml),
* gnu/packages/linux.scm (pamela, ttyebus),
* gnu/packages/lxqt.scm (lxqt-connman-applet),
* gnu/packages/mail.scm (libetpan),
* gnu/packages/man.scm (ronn),
* gnu/packages/music.scm (tascam-gtk, artyfx),
* gnu/packages/networking.scm (srt, lksctp-tools, nng, nanomsg),
* gnu/packages/python-crypto.scm (pure-python-otr),
* gnu/packages/qt.scm (qtspell),
* gnu/packages/raspberry-pi.scm (raspi-gpio, raspi-open-firmware),
* gnu/packages/rdp.scm (freerdp),
* gnu/packages/ruby.scm (ruby-prawn-templates, ruby-treetop, ruby-gimme,
  ruby-standard, ruby-rubocop-ast, ruby-rexml, ruby-range-compressor,
  ruby-regexp-property-values, ruby-regexp-parser, ruby-rubocop,
  ruby-pdf-reader, ruby-pdf-inspector, ruby-prawn),
* gnu/packages/syncthing.scm (syncthing-gtk),
* gnu/packages/video.scm (svt-hevc, mediasdk, libvideogfx, libde265,
  tslib),
* gnu/packages/xml.scm (libxmlb, libxmlplusplus)[source]: Same.
</span></span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2020-10-04 14:35:23 +0200'>2020-10-04</span></td><td><a href='/guix/commit/gnu/packages/rdesktop.scm?id=10ec0ac656986eb606b1b3b1a21808bb2c66cd16'>gnu: freerdp: Update to 2.2.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/rdesktop.scm (freerdp): Update to 2.2.0.
[inputs]: Add libusb.
[arguments]: Remove unused WITH_SYSTEMD configure flag.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>