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Doubling memory - [K2 mod]
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--- System memory update mod by Kofola gang ---
Anybody who tried to make their own image for Katy probably figured out that the linux memory
is totally exhausted. Usually around a maximum of 1 MB remains free (try yourself using
the free(1) command).
If you start up any additional programs (for example the Samba server), linux ends up getting
extremely slow and may start killing running processes in order to free up memory.
First way to add a bit of extra memory is by increasing the bootargs argument "mem=32m" to
something bigger. (Update: Kathrein guys did it exactly this way by switching to "mem=40m").
Another way, which we are proud to describe here, is by replacing the system memory chips.
This mod gets its code-name "K2 mod" and is described below.
[ --------------------------------------------------------------------------------- ]
BIG BIG WARNING
* K2-mod requires soldering which definitely BREAKS YOUR WARRANTY!
* Soldering may damage your box very easily, so you are doing it at YOUR OWN RISK!
[ --------------------------------------------------------------------------------- ]
System memory chips are located on the board between the main CPU STB7100 (biggest chip with passive
cooler glued on it) and the front panel. Originally it is mounted with 2 Hynix HY5DU561622ETP chips,
which gives 64MB of system RAM.
Our modification is based on replacing those 2 chips by double sized ones. We successfully
replaced with Hynix HY5DU121622CTP chips and even by some "noname" chips from a SO-DIMM plate,
which has a similar organization (see Hynix data sheet for the required organization).
The replacement procedure is as follow:
1, replace system RAM chips
2, flash new bootloader
3, enjoy > 70MB of free memory ;)
We know that other chips will work too, but it requires your own modification
of the init code in u-boot. We decided to stay with only one organization, which is the easiest
to support.
For those, who want to try out other chips (meaning chips with a different
internal organization/timing) there is one hint: Check the SYS LMI part of the config registers
to find the correct values for your chips.
--
When you love her nothing else matters.
