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61  Hardware and U-Boot firmware / U-Boot stuff / Re: Where does u-boot store the env variables such as bootargs? on: August 16, 2009, 02:48:14 PM
I have been looking for this too.  A way to configure Sheeva's uboot from its own bash shell to be exact. 

Unfortunately, the fw_printenv and fw_setenv utilities in the installer appear to be compiled for the x86 side of things.
62  Linux Stuff / General Linux questions / Re: Swap file on HDD on: August 16, 2009, 01:31:10 PM
Your torrent session is likely using an amazing amount of memory paging.  Use the "top" command and sort by memory useage with the "M" key to see the offenders.  Top also has a handy "kill" feature if you want to prune the process tree.  The "?" command will show other tricks it can do.
63  Linux Stuff / General Linux questions / Re: New Plugger How To on: August 16, 2009, 01:21:24 PM
That means your vfat module is not loaded when it tries to mount.  I believe you can simply put the name of the module you want loaded into "/etc/modules" or put the modprobe in your rc.local.
64  General Category / General Discussion / Re: Sheeva Plug is a lousy product on: August 16, 2009, 01:15:22 PM
If you "broke" or "bricked" yours through software configuration, sell it on ebay.  Supply and demand: should at least get your purchase price back.  Through the magic of JTAG, these things are very easy to bring back to life for an old school developer.
65  Linux Stuff / General Linux questions / Re: booting up - how fast? on: August 16, 2009, 01:05:45 PM
Run less services and system checks for a faster bootup.  Debian default is to run a lot so you will have a full system.  Getting it to a minimalistic busybox shell in a few seconds after power up can be done.  I have an ARM board set up to do just that 1.3 seconds with a modified bootloader and kernel.  If you know the boot sequence fairly well, its easy to knock out what you don't need and get in the seconds.
66  General Category / General Discussion / Re: Sheeva Plug is a lousy product on: August 16, 2009, 08:05:06 AM
This may not be the consumer device you need.  At all.  For someone like me who has experience working with ARM based embedded devices, this is an excellent product.
67  General Category / General Discussion / Re: Logged in console and ssh at the same time? on: August 14, 2009, 09:48:10 AM
sudo su
68  General Category / General Discussion / Re: Received yours yet? on: August 12, 2009, 09:45:29 AM
I didn't know they came in different colors!  Mine was ghastly iPod white.  I'll take industrial gray any day.
69  General Category / General Discussion / Re: /etc/rc.local not getting run? on: August 04, 2009, 02:52:20 PM
Is rc.local listed in your runlevel directory?
70  Linux Stuff / Kernel / Re: Problem with /dev/random ? on: July 31, 2009, 04:24:40 PM
Not cheap, because they aren't popular enough to mass produce:


Its just a reverse biased diode read by a A/D.  But can be made for $1 on the board if you are handy with a soldering iron and several lines of code.

Some people have taken a simple smoke detector setup to count the time period between alpha particle emissions.
71  Linux Stuff / General Linux questions / Re: Extra gettys on: July 30, 2009, 12:21:28 PM
72  General Category / General Discussion / Re: Received yours yet? on: July 15, 2009, 02:00:07 PM
My account page says "Not Yet Shipped" but received it months ago!  LOL!  But the wait was well worth it.  This has become so useful as a server, I need another few to play with.
73  Linux Stuff / General Linux questions / Re: Safely removing USB drive on: June 14, 2009, 11:34:00 AM
When powered down, the hard drive motor is switched into a generator and the head instantly tracks home with plenty of rpm's to spare.  All drives made in the last 20 years should do it.

If your hard drive is busy by some process, lsof can check to see what is tying it up.  For example,

lsof /dev/sdb1

...will list the processes using that partition.  You can pipe the list of things to be killed directly to "kill" with:

kill -HUP `lsof -t /dev/sdb1`

and then

umount /dev/sdb1;sync
74  Linux Stuff / General Linux questions / Re: Safely removing USB drive on: June 14, 2009, 06:11:27 AM
Unmount and sync the drive first.  Usually unmounting will sync it.  They are made to hotswap.
75  General Category / Application ideas and development Q/A / Re: System services - sendmail on: June 12, 2009, 03:15:04 PM
If I remember right, Sendmail used to be easier to set up because the documentation back then was more organized....

The best thing I ever did was comment in the beginning of my sendmail.mc the setup process:

# make access.db -C /etc/mail
# m4 /usr/share/sendmail-cf/m4/cf.m4 sendmail.mc > sendmail.cf
# makemap hash /etc/mail/access < /etc/mail/access
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