[Bug 217969] Recent buildfailures with Raspberry Pi 2 crossbuilds

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217969

            Bug ID: 217969
           Summary: Recent buildfailures with Raspberry Pi 2 crossbuilds
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: xmj at FreeBSD.org

Created attachment 181018
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181018&action=edit
Raspberry Pi 2 Build failure fixes

Crossbuilding world and kernel for RaspberryPi, I noticed the following (see
patch attached):


1. CloudABI failed, due to a missing include. edje@ helped fix this by pointing
me to <sys/systm.h>

2. sys/cddl/dev/fbt/arm/fbt_isa.c fails likewise, not having a definition for
the `struct trapframe`. Grepping through the kernel sources pointed me to the
"sys/arm/include/frame.h" header, which can be included with <machine/frame.h>.

Patch attached fixes these.

3. Installworld by default fails, but this can be worked around with

make TARGET_ARCH=armv6 UBLDR_LOADADDR=0x2000000 LOCAL_ITOOLS="cc uudecode ls
bzip2 dd" DESTDIR=/mnt/rpi2 installworld

I haven't come up with a good way to patch the build tools to fix 3. yet, open
for suggestions.

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