Date: Wed, 27 Mar 2013 09:48:13 -0700 From: Adrian Chadd <adrian@freebsd.org> To: freebsd-embedded@freebsd.org Subject: FreeBSD on the AP121 (AR9330) Message-ID: <CAJ-Vmom8sbMJvFn1ucGBSiptWtKPC0kE1Ss22Kj-WGVSkP_8ag@mail.gmail.com>
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Hi,
So I have FreeBSD mostly booting on the AR9330 based SoCs.
The trouble? These ship with 16MB RAM and 4MB flash.
CPU platform: Atheros AR9330 rev 1
CPU Frequency=400 MHz
CPU DDR Frequency=400 MHz
CPU AHB Frequency=200 MHz
...
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FreeBSD 10.0-CURRENT #15 r248780:248782M: Tue Mar 26 22:31:51 PDT 2013
adrian@marilyn:/home/adrian/work/freebsd/svn/obj/mipseb/mips.mips/usr/home/adrian/work/freebsd/svn/src/sys/AR9331
mips
gcc version 4.2.1 20070831 patched [FreeBSD]
WARNING: WITNESS option enabled, expect reduced performance.
Preloaded elf kernel "kernel" at 0x80538074.
real memory = 16777216 (16384K bytes)
Physical memory chunk(s):
0x005d2000 - 0x00f90fff, 10219520 bytes (2495 pages)
avail memory = 9768960 (9MB)
The kernel is 4.5MB in size uncompressed and takes up ~ 2.5MB of RAM
just at startup. It's not going to be able to really do anything with
our current userland without killing processes. I know it won't even
be able to load the wlan/ath/bridge/switch modules.
So at this point I'm really, really looking for some help with cutting
down both the kernel binary size and the kernel memory footprint. It's
a bit ridiculous at this point.
The AR9330 is in a lot of the really cheap, really small APs that
companies like TP-Link make in ridiculous quantities. I'd love to
showcase FreeBSD + mesh on these, but there's just not enough space to
run things.
So, who's up for it? I can send you hardware if you start making
progress. Lots and lots of embedded hardware.
Thanks,
Adrian
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