[vdr] Re: Increasing SDRAM on DVB cards

[Hermann Gausterer <mrq1@gmx.net>]

> The card has 2MB of DRAM (which is relatively slow) and 2MB of (fast)
> SDRAM. The SDRAM is the one used for video decoding (buffer) and OSD.

what are the adress ranges the two consume in the "virtual" rammap
of the DSP? are the close to another?
(i think you have access to the firmware-source, and know this, klaus *sfg*)

the reason for my question:
i think the easiest way for doing this what you want to do is, 
replace the chip with an pincompable type with more capacity

accourding to the docs, brought to us by Stefaan Coddé (thank you !!)
the dram chip has 11 adress lines 
and they are used in the form:

A 0 - A 10
R o w   A d d r e s s   :   R A 0   ~   R A 1 0 ,   C o l u m n   A d d r e
s s   :   C A 0   ~   C A 7
A u t o - p r e c h a r g e   f l a g   :   A 1 0

but the CHIP (the DIL housing) has allready forseen an A 11

for this layout, it is clear that A0 - A10 MUST be allready wired to the DSP
and if we/you get an replacing part, simple look for an which can do 
on bit more on the COLUMN mode and you have your 4mb

for this to work, the hardware adressdecoder for the two different
ram chips have to be a GAP between DRAM and SRAM

this layout is only guesed, for explanation only !!!!!

0FFF:FFFF----------------------(x+2 mb)
###########    SRAM   #########
0FE0:0000----------------------(x mb)

003F:FFFF----------------------(4 mb)
#######  DRAM FUTURE !!! ######
001F:FFFF----------------------(2 mb)
###########    DRAM   #########
0000:0000----------------------(0 mb)

with this no change to the hardware decoder would be needed
but only somebody with knowledge of the firmewareinternals
can answer and help here !

hermann

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