Hi,

I've been trying to build a system image with the following command:
> $ guix system image --target=arm-linux-gnueabihf -t raw-with-offset \
> minimal.scm

And the following minimal.scm:
> (use-modules (gnu)
>              (gnu bootloader u-boot))
> (use-service-modules networking ssh)
> (use-package-modules bootloaders screen ssh)
> 
> (operating-system
>   (host-name "qemu-arm")
>   (timezone "Europe/Paris")
>   (locale "en_US.utf8")
>   (bootloader (bootloader-configuration
>                 (bootloader (bootloader (inherit u-boot-bootloader)
>                                         (installer #~(const #t))))))
>   (kernel-arguments '("console=ttyS0,115200"))
>   (file-systems (cons (file-system
>                         (device (file-system-label "my-root"))
>                         (mount-point "/")
>                         (needed-for-boot? #t)
>                         (type "ext4")) %base-file-systems))
>   (users (cons (user-account
>                  (name "gnutoo")
>                  (group "users")
>                  (supplementary-groups '("wheel" "audio" "video")))
>                %base-user-accounts))
>   (packages (append (list screen) %base-packages))
>   (services
>    (append (list (agetty-service (agetty-configuration (extra-options '("-L"))
>                                                        (baud-rate "115200")
>                                                        (term "xterm-256color")
>                                                        (tty "ttyS0"))))
>            %base-services)))

And it gives me that error:
$ zcat qsh8mas9r3fsmd7q1rn8idaj8ja57n-linux-modules.drv.gz | sed 's#^#> #'
> Backtrace:
>            5 (primitive-load "/gnu/store/p3anj14w2svvcrchshnfkxap6j3?")
> In ice-9/eval.scm:
>     619:8  4 (_ #f)
>    626:19  3 (_ #<directory (guile-user) 7ffff5fdbc80>)
>    293:34  2 (_ #(#<directory (guile-user) 7ffff5fdbc80> #<procedu?>))
> In srfi/srfi-1.scm:
>    586:17  1 (map1 ("ahci" "usb-storage" "uas" "usbhid" "hid-gene?" ?))
> In gnu/build/linux-modules.scm:
>     269:5  0 (_)
> 
> gnu/build/linux-modules.scm:269:5: kernel module not found "ahci" "/gnu/store/0v0b3vb7wgavq9s4yck6hpqjm981ixg3-linux-libre-6.0.15/lib/modules"

It worked long time ago (probably around the time where Guix 1.3 was
released), 
so some regression probably happened somewhere.

Denis.