<toddpratt>
hi. I have a cubietruck and I get no HDMI out when running linaro (HDMI out works in Android). This is my disp_init section: http://pastebin.com/PkQZHPz7
<toddpratt>
I've tried different disp_mode settings, also.
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<cagedwisdom>
does the cubietruck have a little connector for a WIFI antenna or do you have to solder that yourself?
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<joedj>
heyas, i'm trying to get wpa_supplicant working with lubuntu-desktop using /etc/network/interfaces. it seems that wpa_supplicant is starting before the wifi driver is ready. /var/log/syslog says "wpa_supplicant[294]: Could not read interface wlan0 flags: No such device" / "wpa_supplicant[294]: wlan0: Failed to initialize driver interface" followed by "kernel: [ 23.389263] Broadcom Dongle Host Driver: register interface [wlan0]" a tiny bit later (in the same
<joedj>
second)
<joedj>
i've tried a few things like pre-up /sbin/modprobe bcmdhd and pre-up /bin/sleep 10 but no dice...does anyone have an elegant solution?
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<joedj>
so much for elegant, but at least i have wifi soon after boot: upstart script to run/respawn wpa_supplicant, cron job to restart wlan0 interface every minute if it doesn't have an IP
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<rneese>
morning
<rneese>
well I have to say the cubieboard with android runs better then with the odroid 4.1.1 android
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<Ti_W_B>
Hello~
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<buZz>
heh cool
<buZz>
neon compiled cpuminer runs slower on cb2 compared to non-neon
<buZz>
whereas on omap4460 its like 2x faster
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<jelly-home>
memory bandwidth issues?
<buZz>
quite possibly, scrypt is memory intensive
<ssvb>
buZz: NEON is seriously downgraded in Cortex-A7, it has only half throughput (128-bit operations need 2 cycles instead of 1 on Cortex-A8) and can't dual issue
<buZz>
and A15?
<ssvb>
A15 is fast
<ssvb>
NEON on A15 effectively can handle 192 bits of data per cycle for integer workloads
<ssvb>
(dual issue a 128-bit instruction with 64-bit instruction)
<buZz>
yeah i just submitted cubie to that link up top
<buZz>
ssvb: so, for neon cubie1 would be faster?
<ssvb>
buZz: yes
<buZz>
nice
<buZz>
sadly i borrowed it away :P
<ssvb>
buZz: but cubie2 is dualcore, so overall performance is probably still better for cubie2
<buZz>
not sure
<buZz>
omap4460 does over 1khs per core
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<buZz>
but thats A9
<buZz>
anyway, without neon omap4460 performs similar to cubie2
<ssvb>
how much did you get on cubie2?
<buZz>
0.82khs total for both cores
* buZz
revalidates 1khs for omap4460
<ssvb>
buZz: for cubie1 it is 0.88 khash/s for "minerd --benchmark" at 1.008GHz
<ssvb>
buZz: with NEON
<buZz>
pretty impressive
<buZz>
so cubie1 is faster than cubie2 ;)
<ssvb>
for certain things - yes
<ssvb>
with cortex-a7 their intention was likely to simplify the cpu as much as possible, so that it still performs good on typical code produced by the compilers
<jelly-home>
less watt, more tablet life
<ssvb>
and get more performance by just providing more cores
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<ssvb>
the hand coded assembly optimizations (openssl encryption, scrypt mining, ...) allow to get closer to the theoretical peak performance
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<utente>
A20 soc, to me, is a *fake* soc. I hope allwinner will do a *real* A20 that double the A10 cpu.
<mnemoc>
weird definition of "fake" you have
<utente>
cos A10 has cortex-a8, A20 has cortex-a7. folllowing the "commercial" name, you can think it is the "double" of A10, but it is not. in facts, A10 is better of A20 in some cases: it should not be possible if A20 were really a "doubled" A10.
<mnemoc>
nothing meaningful can be taken out of the marketing names of allwinner chips
<mnemoc>
even their sunNi notation was redefined with the A23 SDK
<utente>
marketing name are made to cheat customers :-)
<ssvb>
utente: A20 is more balanced than A10, you are less likely to get something that performs pathologically bad
<mnemoc>
try to explain ARM cortex-a* numbering
<ssvb>
utente: on the other hand, something that used to perform exceptionally good, got tuned down too :)
<utente>
mnemoc, that is another headhake. i searc aroud a lot a comparison table for cortex cpu without success. ARM holding thake that information in "dark mode".
<utente>
ssvb, A20 is "hot", i dislike "hot" ARM soc.
<utente>
with "hot" i refere to temperature.
<ssvb>
also cortex-a8 simply does not support multi-core configurations, so dual-core cortex-a8 is out of question
<utente>
ssvb, rellay? bad news to me .-(
<ssvb>
it is not like allwinner had much choice other than maybe using cortex-9 instead of cortex-a7
<ssvb>
*cortex-a9
<utente>
i get impression after initial success, allwinner is going into a cul-de-sac.
<ssvb>
"Within the same pipeline length the design team focussed on increasing dual-issue, in-order performance as far as we possibly could. This involved symmetric dual-issue of most of the instruction set, more forwarding paths in the datapaths, reduced issue latency, ..."
<ssvb>
they did not mention NEON though
<utente>
if an arm soc requires a heat dissipartor, for me it is out.
<ssvb>
it looks like A53 got reworked quite a lot compared to A7, bringing back some of the A8 performance features like real dual-issue
<ssvb>
utente: have you tried undervolting A20?
<ssvb>
utente: how hot is it running for you?
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<utente>
ssvb, i feel good with cubie (A10), i was interested in cubie2, but after i hear it need heat dissipator i said "no, thanks".
<utente>
so i didit buy cb2
<VargaD>
cubie 1 can also be quite hot without a heat dissipator
<utente>
VargaD, if you stay at 1008-1104Mhz, temperature is - in my opinion - accettable.
<ssvb>
utente: oh, then I can tell you that a10 can also run quite hot if you really stress it
<utente>
ssvb, please, tell me your definition of "stress".
<VargaD>
I haven't overclocked my cubieboard, I haven't mesured the temperature, but it feels hot when I run android and some demanding 3D apps
<VargaD>
ssvb: even better to stress the cpu :)
<ssvb>
utente: the point is, the power consumption of modern SoCs is seriously non-uniform and depends on what you are doing with it
<ssvb>
utente: also you maybe have heard about turbo-boost, turbo-core and other similar buzzwords
<utente>
ssvb, if you ise specializerd soft to stress the cpu, then it will hotted. my experoience doenst go over desktop application and fideo reproduction (matriska format)
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<utente>
i forced my CB1 till 1200Mkz, it runn stable (but in "desktop" evironment, i mena libreoffice, firefox, gmplayer, etc)
<VargaD>
I don't turn off my cubieboard and I can't check it's temperatore every minute, so I don't allow more than 600mhz till I can find a heat dissipator
<mnemoc>
VargaD: olimex is selling them for A10/A20
<VargaD>
thanks, I tried to buy one in the local shops but they don't have such a small heat dissipator
<ssvb>
the thing that I like about A53 in that interview - "Cortex-A53 has been designed to be able to easily replace Cortex-A7. For example, Cortex-A7 supports the same bus-interface standards (and widths) as Cortex-A7 which allows a partner who has already built a Cortex-A7 platform to rapidly convert to Cortex-A53" :)
<utente>
ssvb, how to undervolt/overvolt A10?
<utente>
VargaD, you can cut off a dissipatori from recivled old mainboard
<ssvb>
utente: there is a cpufreq table in the kernel where you can tweak voltages
<utente>
recicled*
<VargaD>
hmmm, good idea I have some very old motherboards
<utente>
i kow i can chage cpufreq, not how to change voltage
<utente>
VargaD, u will save many bucks :)
<ssvb>
utente: but it always makes sense to check whether the changes have any effect by checking the current draw with a multimeter
<ssvb>
mnemoc: though the things like scratchbox and maybe some other build systems allow to use a gcc crosscompiler running on x86 natively, while letting qemu handle the configure cruft
<mnemoc>
ssvb: ow
<steev>
yeah, qemu is slow
<ssvb>
emx: qemu is a universal solution which supports multiple cpu architectures, the other specialized emulators may be a lot faster
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<emx>
does 2MP in Mali400MP2 stand for 2 processors?