Quote:
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Originally Posted by wallcraft
I would be concerned about adding swap on a CF card, because these don't always mount at boot time.
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I agree, this clearly speaks for MMC.
Quote:
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Originally Posted by wallcraft
In any case, the addition of card-based swap would need to allow for the possibility that the card was missing at boot time.
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This is why I proposed a script that tests for the existance of a swap-partition.
For MMC this could be changed to :
* Test if MMC-Card present
* Mount MMC-Card (alternativ: test if already mounted)
* Test if SWAP-File present (fairly easy)
* activate SWAP.
run at boot-time or after inserting the card - Linux is fairly easy on adding or removing swap.
--edit:
Creating the swap-file:
'dd if=/dev/zero of=[path to mmc-card]/swpfile bs=1M count=[größe des swapfiles in MB]'
'mkswap [path to mmc-card]/swpfile'
Example:
dd if=/dev/zero of=/media/mmc/swpfile bs=1M count=256
mkswap /media/mmc/swpfile
(erzeugt ein 256MB Swapfile)
Shellskript (assuming that MMC-cards are mounted at boot-time and that the command 'swapon' is available.)
#! /bin/bash
mmcFolder = [Pfad zu MMC auf iLiad]
swapActivated = 0
if ( -e $mmcFolder/swpfile ) ; then
swapon $mmcFolder/swpfile && swapActivated = 1
fi
if ( $swapActivated -gt 0 ) ; then
echo "Jipii! We have swap!"
free
else
echo "Baah, no swapping for you!"
fi
---
The last 'if' could be used for a more sofisticated error-handling, but it should do as an example.
If someone would be willing to test it, I could try to compile the swap-utils and the appropriate kernel - with absolutely NO WARRANTY that it won't brick your system as it would be completely untested.
On the other hand it should be fairly easy to implement yourself.
-- edit 2:
https://www.mobileread.com/forums/sho...ghlight=swapon
mentions, that Adam B. has ported a busybox-variant with swapon / swapoff. Thus only the kernel is missing.
Or am I just being stupid and writing stuff everybody knows?
-- edit 3:
Seems I really am stupid - and much to used to kernel 2.6 .. IIRC the option to "disallow" swapping has been added to the kernel-config in kernelfamily 2.6, 2.4 doesn't have this option ... So: Swapping should already be possible. If not it is more difficult.
Anybody willing to try if swap is working? Or perhaps has already done so?