Puppi Raspberry Pi Hardware

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Lobster
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#101 Post by Lobster »

antiloquax wrote: (you'll have to change the paths to to where you have your zImage and debian root file system).

Here's a screen-shot to prove it works!
pics available
It must be true :)
thanks for that

I am confused by these two options
and what the locations refer to? :oops:

Code: Select all

-hda /mnt/sda6/Images/deb.ext4 -kernel /mnt/sda6/Images/zImage_3.1.9 
Are you using the image provided by RPi?
here:
http://www.raspberrypi.org/downloads
Something else?

my script looks like this but is wrong?

Code: Select all

qemu-system-arm -M versatilepb -cpu arm1176 -m 256 -hda /mnt/home/iso/rpi/debian6-17-02-2012/debian6-17-02-2012.img -kernel /mnt/home/iso/rpi/debian6-17-02-2012/debian6-17-02-2012.img -append "root=/dev/sda" -serial stdio -redir tcp:2222::22 -net none
I have Qemu running (it was slow - 3/10 minutes to run,
first time I ran the shell script though it had crashed . . . ) :?
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antiloquax
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#102 Post by antiloquax »

Hi Lobster:

The file I have called deb.ext4 is the root file system of the Debian image provided by RPi foundation. I extracted it using the instructions on this page (although I think is should work with the full image also).

You seem to have 2 references to the Debian image, Lobster, the "-kernel" section needs to point at a Linux kernel. I've used the zImage that you can download at the same page I linked to above.

mark
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#103 Post by Lobster »

Thanks Mark,

Had a go with your instructions (many thanks).
This time qemu came up almost instantly and the linux image seems to have loaded and then Linux ARM Debian (Rpi ver) started to boot
but then . . . see enclosed image :cry:

In the instructions you provided can I use their 'offset' setting or do I have to run the command and get my own?
We can now extract the Debian rootfs using dd and the offset (startsector) and size returned the the file utility.

dd if=debian6-17-02-2012/debian6-17-02-2012.img of=rootfs_debian6_rpi.ext4 skip=157696 count=3256320
Good thing you are a teacher. We might have a chance :)

Things we need to look at are ISO remastering in Debian
So basically we can cut debian to Puppy essentials - and use aptget to add Puppy programs.
If we can boot into JWM (preferably) have the icons and programs Puppys are familiar with
this would be a great pre-alpha or even build to bootstrap from . . .

Meanwhile I am still trying to boot up :wink:
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#104 Post by antiloquax »

To extract the root filesystem, I did use the "file" command to check, but the numbers were the same.

It looks like the problem was mounting the root file-system (do you think that was it?) I'd have a go at extracting it as per those instructions.

Then you'll have to give me more advice on doing things like getting JWM. Could be difficult w/out network.
mark
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#105 Post by Lobster »

Could be difficult w/out network.
oh yeah . . . for sure . . . :shock:
. . . actually I was promised an A board (never happened) no ethernet
anyway if getting QEMU going - we are moving in the right direction . . .

With network
we go to the command line
I think we may have to go sudo (to become a superuser)
and then apt-get install jwm

There is also a way of checking if jwm is available
If you type
apt-cache show jwm it might already be there? (no need for network)

OK back to my boot up problem . . . :)
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#106 Post by Lobster »

OK back to my boot up problem . . .
but the numbers were the same.
mine too . . .
so not that . . .

OK tried various things
including a frugal install (in case Qemu could not use the DVD)
still not able to boot.

Have to leave for now :oops:
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nice video of the delivery

#107 Post by don570 »

There's a nice video of the delivery of the computers.
http://www.itv.com/news/central/2012-04 ... pberry-pi/

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#108 Post by Lobster »

Image

Thanks don570 :)

Every morning I sit like a good Puppy
fangs ready to tear apart the packaging
that may contain even a ripple of raspberry.

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#109 Post by humblesoul »


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#110 Post by Lobster »

Raspberry Pi arrived. :D

Problem 1 – there are two sorts of micro USB and I had the fatter one – wrong :oops:

Problem sorted (friend came with 5v 1A supply) and slim micro USB


Problem 2 – No signal on TV

Tried two different HDMI cables, checked they were 1.3 and above, they were

Tried two different SD cards (one with Debian and one with Fedora) still 'no signal' message on TV. Tried RCA cable – no signal.


What to try next? :shock:
Last edited by Lobster on Sat 14 Apr 2012, 23:25, edited 1 time in total.
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#111 Post by Aitch »

Lobster

I hope you are using hdmi to hdmi for your video tv i/p, as converter cables don't work!

You could get video w/o sound via the composite phono o/p to a scart to phono adapter in the back of most TVs, but hdmi is a complex digital video plus stereo mix with proprietary protection built-in....converter cables need a digital decoder of sorts, and are probably dearer than the pi itself...

Else try an hdmi to DVI converter cable with a monitor...again, no sound

new toy, new problems :wink:

Aitch :)

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#112 Post by Dave_G »

Lobster

Check your config.txt file on the SD card.
See here:
http://elinux.org/RPi_config.txt

You will have to add the following lines for "RCA" output:

SDTV_MODE_PAL = 2, /**<Normal PAL */
SDTV_ASPECT_4_3 = 1, /**<4:3 */

and possibly delete the one/s with any reference to HDMI_
or the other way round if you want to use HDMI.
(Don't know if the Pi can give out composite and HDMI video simultaneously, I suspect not).

Be wary of HDMI as not all sets can handle all HDMI resolutions
and always use HDMI input number 1 when testing if your set
has more then one HDMI input.

Hope it helps.
[/url]
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#113 Post by antiloquax »

Lobster wrote:Raspberry Pi arrived. :D
Wow - colour me jealous.
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#114 Post by Lobster »

Non working pi colours me raspberry . . . :oops:
Be wary of HDMI as not all sets can handle all HDMI resolutions
and always use HDMI input number 1 when testing if your set
has more then one HDMI input.
tried both HDMI 1 and 2 - using 2 at the moment will go back to 1
- will try changing resolution (if possible)
Also the HDMI cable seems aprox 1.5 metres - could that be too long for the Pi to power?

I feel such a foolish noob :oops:
My friend Shadow (who used to be a computer engineer) is beginning to suspect the board
N n n n n n o o o o o . . . . (screaming crustacean . . .) :wink:

I am working on the premise that the board works
and the tv or cable (or possibly SD card is at fault)
More tests . . .
be back shortly with more info.

Any suggestions considered . . .
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#115 Post by Dave_G »

Since you have no video output, are you 100% that the Pi is actually booting?

If so, double check your config.txt file.
Look at the different HDMI resolutions available at the site
I previously posted a link to.

Best to choose a resolution in the middle of the range, say:

HDMI_CEA_720p50 = 19,

and avoid the ones that use 1080 for now.

The reason I say always use input 1 on HDMI, is that some sets seem to
have a problem reporting their capabilities to hosts when interrogated
on the other HDMI inputs.
By default Pi interrogates the HDMI set to see what it's capabilities are
then I assume it sets the port to maximum resolution that the set can handle.
This can be over-ridden by specifying a specific resolution in the config.txt file.

aarf

#116 Post by aarf »

Lobster wrote:Raspberry Pi arrived. :D

Problem 1 – there are two sorts of micro SD and I had the fatter one – wrong :oops:

Problem sorted (friend came with 5v 1A supply) and slim micro USB


Problem 2 – No signal on TV

Tried two different HDMI cables, checked they were 1.3 and above, they were

Tried two different SD cards (one with Debian and one with Fedora) still 'no signal' message on TV. Tried RCA cable – no signal.


What to try next? :shock:
it all a plot by the evil micro$shaft

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#117 Post by Dave_G »

Lobster

Also look here:
http://elinux.org/RPi_VerifiedPeripherals
scroll down to the section on SD cards for a list of compatible SD cards and those that don't work.

Apparently not all SD cards are created equal.
Also see here:
http://www.raspberrypi.org/forum/genera ... e-3#p39181

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#118 Post by Lobster »

Here was the Raspberry Pi this morning residing on a cushion surrounded by a lime hub and being offered appropriate nutrition after its journey from Cambridge . . .

Lobster being grilled by Raspberrians
http://www.raspberrypi.org/forum/absolu ... al/#p63957

I am a bit loath to edit the Debian SD card just yet . . .
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#119 Post by Dave_G »

Lobster

Are the led/s as described by the guys over at the Pi forum on?
Can you connect a network cable to the Pi to see if the Lan led comes on?

Have you checked that the stuff that is supposed to be on the SD card
really is there and if you can see /boot/config.txt when the SD card is connected
to a PC running Puppy?

Judging by what the guys over at the Pi forum describe, have you tried
the suggestion of not connecting the HDMI lead and using only the RCA?

If the rest of the family are taking over the TV set and you
want to carry on testing, then you can always connect some amplified
PC speakers to the RCA jack of the PI's video output.
Yes, you read that correctly, connect the video output of the Pi to a set
of speakers which have a built-in amp (not just passive speakers), turn
the volume right down, boot the Pi then slowly turn up the volume.
If you hear a raspy, regular buzz/noise then you have video.

This is safe to do as composite video is 1 volt peak to peak into 75 ohms
where as line level audio is around 1.5 volts into a higher impedance.
Since amplified speakers have an input impedance much higher then 75 ohms, it can't overload the Pi's video output.

This trick also works with 32 ohm headphones (not the 8 ohm types).
Here the impedance is about half the required 75 ohms but still not low
enough to cause any damage.

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#120 Post by Dave_G »

Now that you have posted that pic, I think I know what your problem is.

Apples, blackberries and raspberries don't mix. :-)

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