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 Forum index » Advanced Topics » Puppy Projects
pUPnGO - 6Mb ISO - Basic Building Block Puplet
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gabe

Joined: 03 Apr 2009
Posts: 85
Location: Minnesota, USA
PostPosted: Mon 06 Dec 2010, 15:13    Post subject:  
I understand the purpose of your project is small embedded systems/saa, but I'm curious as to whether this can turn an old (48MB RAM) desktop into something of a word processor/basic media player. Would turbopup be better for this purpose?
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Mon 06 Dec 2010, 16:47    Post subject:  
gabe: I would try TurboPup first - I haven't tested it my self - but if it works its a lot easier than building a desktop on pupngo. If you want to play with pupngo anyway - try the BL3-sfs linked in latest version-post. BL3 has Abiword as an add-on and in one of the external links on the BL3 homepage there is a static build of mplayer. I have tested both and they seem to work.
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Wed 08 Dec 2010, 17:08    Post subject:  COPY2RAM  
COPY2RAM is hardcoded to be done if RAMSIZE greater than 220Mb. I would like to make this dynamic and depending on the size of pup_412pupngo.sfs. But what should be the minimum size to handle load of kernel and initrd?
Any suggestions? Any rules of thumbs here?
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Wed 08 Dec 2010, 17:50    Post subject:  
Re COPY2RAM:
I posted this to Barry's Blog a while back and he has since integrated it into woof. (See init in latest wary/quirky release) I can check it out when I get back home if you need help locating the code block.
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xyrion

Joined: 30 Nov 2010
Posts: 4
PostPosted: Wed 08 Dec 2010, 18:46    Post subject:  
My plan is building a diskless PC that will netboot from my machine and load itself into RAM (only 256 MB available). I'm going to use it for one thing only -Music Player Daemon server.

I think your supermini superawesome pUPnGO is the right thing for this job, right? Any suggestions on this setup? Anything I should worry about? I'm a bit of a noob in console, but I'll learn as I go.

I don't need MPD client on that box, so I guess I don't have to load X?

I'm going to hook up a USB DAC on that box. Would your 4 MB build autodetect such a device? It's using standard USB Audio driver on more common distros (Ubuntu, Mint...), so I guess it's not something too exotic.
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Wed 08 Dec 2010, 22:59    Post subject:  
here is the key code
Code:
RAMSIZE=`free | grep 'Mem:' | tr -s ' ' | cut -f 3 -d ' '`
SIZESFSK=`du -k ${PUPSFSDEVMNTPT}${PUPSFSFILE} | cut -f 1`
#need to add a "fudge factor" to the size of the sfs
# ... 32Mb maybe enough ... 16Mb if nox (32768 ... 16384)


@xyrion
if you are just wanting to play mp3s you can try minimp3 ... other than that you only need what you need - try the full driver version and use the zdrv cutter
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Thu 09 Dec 2010, 00:43    Post subject:  
technosaurus: Thanks a lot!

xyrion: Maybe you can use something from this post?
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xyrion

Joined: 30 Nov 2010
Posts: 4
PostPosted: Thu 09 Dec 2010, 05:51    Post subject:  
No MP3s, I only play FLAC.

Thank you both. That m_serv looks like a great plan B. Smile
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Sat 11 Dec 2010, 11:38    Post subject:  Save2CD/DVD and load sfs-files - is that possible?  
I am working on an add-on pet containing the missing progs for pupngo to be able to save to CD/DVD. I have never used this save-method myself and I do not see any code making it possible for a saved2cd system to load an additional sfs-file sitting on the CD/DVD...
Is this possible?
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Sat 11 Dec 2010, 17:18    Post subject: Re: Save2CD/DVD and load sfs-files - is that possible?  
goingnuts wrote:
I am working on an add-on pet containing the missing progs for pupngo to be able to save to CD/DVD. I have never used this save-method myself and I do not see any code making it possible for a saved2cd system to load an additional sfs-file sitting on the CD/DVD...
Is this possible?

sfs linker?
http://murga-linux.com/puppy/viewtopic.php?t=47976

the package may need some de-roxification and could be much smaller if the ldconfig from uclibc is used and sln is replaced with a script
Code:
#!/bin/sh
#replaces sln - recommend using a static uclibc busybox
busybox ln $@

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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Sat 11 Dec 2010, 17:52    Post subject:  
technosaurus: You are swift as always - thanks. Yes, I can mount sfs-files on the cd and do something as the sfs-linker - but my question was if P412 (or other Puppy-versions) running as a save2cd system is able to load any sfs-files on the cd after creating a save folder on the cd (by it self...)

Guess it should be...or are Puppy running only from and saving to CD/DVD not able to use additional sfs-files at all?

Another thing that puzzles me is:
If I burn pUPnGO to a CD-RW and boot, zdrv is not picked up.
If I burn the same image to a DVD_RW and boot, zdrv is picked up.
In both cases copy2ram is used.

If i boot the same CD-RW in a lower-ram system (not copying to ram) zdrv is loaded.

Some timing in initrd? Seems to have something to do with copy2ram and CD-RW....
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Sat 11 Dec 2010, 22:29    Post subject:  
I never reallylearned all of the pupmodes, perhaps there is a different mode for dvd vs cd? ???
As for the zdrv I guess its size should be used in the copytoram calculations before copy and mount.(instead of just the main sfs)
I like jrb's tcl style linker better than the unionfs setup, because it should work regardless of the install type.... including the cd/dvd mode.
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Sun 12 Dec 2010, 09:21    Post subject:  
To be able to save to cd/dvd we have to run in ram (copy2ram in use) - otherwise you can not umount main-sfs or zdrv-sfs. If I deactivate copy2ram for zdrv, zdvr loads fine and main-sfs goes to ram but save2cd is not possible as zdrv-loop-mount is in use.
P412 is not really fit for a zdrv-approach and pupngo is hacked/fixed by using zdrv-code from P431 in initrd - otherwise zdrv is not picked up after creating a frugal-savefile.

I think I have isolated the CD-RW/DVD-RW/copy2ram issue to be happening in the zdrv-code-block:
Code:

############pupngo zdrv hack/fix#############
ZLAYER='' #v4.02
ZFACTOR='' #v426
# note, traditionally, loop2 kept free for scripts to use.
if [ "$ZDRVINIT" != "yes" ]; then
  # v4.02 if ZDRV located, and mounted, put it into the unionfs...
  if [ "$ZDRV" != "" ]; then
    ZDEV="`echo "$ZDRV" | cut -f 1 -d ','`"
    ZFS="`echo "$ZDRV" | cut -f 2 -d ','`"
    ZFILE="`echo "$ZDRV" | cut -f 3 -d ','`"
    MNT_ZFILE=""
    [ -f /mnt/dev_save${ZFILE} ] && MNT_ZFILE="dev_save"
    [ "$MNT_ZFILE" = "" ] && [ -f /mnt/dev_ro2${ZFILE} ] && MNT_ZFILE="dev_ro2"
    ZBASENAME="`basename $ZFILE`" #v426 moved up.
    if [ "$MNT_ZFILE" != "" ]; then
      #w020 do not ever copy it to ram... w460 restore choice...
      if [ "$COPY2RAM" = "yes" ]; then #256MB system. note, only checking physical ram.
        SIZEZK=`du -k /mnt/${MNT_ZFILE}${ZFILE} | cut -f 1`
        SIZEZK=`expr $SIZEZK + 1000` #some slack.
        mount -t tmpfs -o size=${SIZEZK}k tmpfs /mnt/tmpfs2
        cp -af /mnt/${MNT_ZFILE}${ZFILE} /mnt/tmpfs2/
        sync
        losetup /dev/loop3 /mnt/tmpfs2/${ZBASENAME}
      else
        losetup /dev/loop3 /mnt/${MNT_ZFILE}${ZFILE}
      fi
      mount -r -t squashfs -o noatime /dev/loop3 /pup_z
      if [ $? -eq 0 ];then
        ZLAYER=':/pup_z=ro'
        ZFACTOR="$ZBASENAME" #v426
      else   #added debug code - this is where cd/dvd difference happens
        echo "" > /dev/console
        echo "debug - CD_RW ends up here if copy2ram is done" > /dev/console
        echo "debug - DVD_RW do not..." > /dev/console
        read dummy
      fi
    fi
  fi
fi
############hack end##################


So problem seems to be that the CR-RW for what ever reason is not able to do the
Code:
mount -r -t squashfs -o noatime /dev/loop3 /pup_z

if the copy2ram-code block is run before it...

I am not presenting the solution - only a status of my debugging findings. Seems that every variable have same value before the code-block is run and do not depend on whether its a CD-RW or a DVD-RW.

Update 131210: Did not find any working solution but below hack secure that modules are loaded from zdrv although save to cd/dvd will be disabled (if installed):
Code:
mount -r -t squashfs -o noatime /dev/loop3 /pup_z
      if [ $? -eq 0 ]; then
        ZLAYER=':/pup_z=ro'
      else   #no copy2ram hack
        losetup -d /dev/loop3
        umount /mnt/tmpfs2
        sync
        losetup /dev/loop3 /mnt/${MNT_ZFILE}${ZFILE}
        mount -r -t squashfs -o noatime /dev/loop3 /pup_z
        ZLAYER=':/pup_z=ro'
        echo -en "\\033[1;31m" >/dev/console #31=red
        echo "">/dev/console
        echo "Could not load modules into ram. Save to CD/DVD disabled" >/dev/console
        echo "if installed - try burning iso to another media to fix..." > /dev/console
        echo -en "\\033[0;39m" >/dev/console
      fi

Update 151210: Almost sure now, that the problem only occurs if CD is a defective burn. CD-RW´s that verify the burn works fine whereas CD-RW that do not verify the burn fails in loading zdrv to ram - even though they work fine if you do not copy2ram...
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goingnuts

Joined: 07 Dec 2008
Posts: 626
PostPosted: Wed 15 Dec 2010, 13:18    Post subject: Updates  
Attached extended versions of pkgstall/pkgremove [pupngo041210_SP2.pet] install/remove pet, sfs, tgz, rpm and deb-files. Nice to have if you want to try the bl3dressup or your own home brewed dress-up-sfs´s...Install this before pupngo041210_SP3.pet.

Also attached pupngo041210_SP3.pet - Save to CD or DVD (RW-types). Approx. 1200Kb installed...but I cheated - used upx on the binaries. Contains static build of the programs needed and updated versions of functions4puppy and rc.shutdown. Additional - burnisotools.sh - is included - burn iso´s to CD/DVD_RW. Please read previous post - its important that your burn verify if zdrv should succeed to load in ram.
pupngo041210_SP3.pet
Description  Save to CD or DVD. Static build of the programs needed/updated functions4puppy and rc.shutdown
 pet

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Filename  pupngo041210_SP3.pet 
Filesize  1.04 MB 
Downloaded  154 Time(s) 
pupngo041210_SP2.pet
Description  Extended version of pkgstall/pkgremove. Install/remove pet, sfs, tgz, rpm and deb-files
 pet

 Download 
Filename  pupngo041210_SP2.pet 
Filesize  4.65 KB 
Downloaded  134 Time(s) 
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technosaurus


Joined: 18 May 2008
Posts: 3843
PostPosted: Wed 15 Dec 2010, 15:59    Post subject:  
Sorry I couldn't help out with the save2cd thing - I never use it, but you got me thinking about the possibility of a better way.
1. mount any and all sfs using methods from jrb's sfs/tcz linker
2. Mount a new save file during startup (a compressed 2fs file stored in the initrd)
3. On shutdown (or at the users request ... at a later date) convert to an sfs file and save to disk (or not, if the user declines) with a number suffix XX (one greater than the highest already on disk)
4. On subsequent reboots all the sfs files are loaded, then the save files (in order) and finally a new save file from a compressed .2fs in initrd

(May need to have a couple different sizes of 2fs.bz2 for low ram machines and for those who may want to store more since they need to be mounted in ram .../tmp or /dev/shm would work ... or to disk if insufficient ram)
Note 2fs compresses much better than 3fs or 4fs
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