Re: COLDFIRE RAM RECONFIGURATION

=0D=0AOn Apr 16, 2010, at 8:09 AM, Alessandro Guerra wrote:=0D=0A> I have h=
ave a COBRA5329 board mounting Coldfire MCF5329, with dBug=0D=0A> and uClin=
ux=2E=0D=0A> On the board there were 16 MB of ram, but I ordered=0D=0A> to =
mount 32 MB to write a better application=2E=0D=0A> dBug is configured to s=
ee 16MB of ram and I cannot recompile it=2E=0D=0A> The only way I have to s=
ee the total 32MB ram is to reconfigure=0D=0A> the sdram controller on uCli=
nux, beacuse at the moment uClinux=0D=0A> sees only 16MB (the dBug configur=
ation)=2E=0D=0A> I tried to simply rewrite the various registers, but it do=
esn't=0D=0A> work=2E=0D=0A> Does anyone know how to reconfigure the sdram c=
ontroller at run=0D=0A> time?=0D=0A=0D=0A=0D=0ANot sure if this is possible=
=2E The reason SDRAM configuration is done while running in the boot loader=
 is that the code is not running out of SDRAM at the time=2E If you're reco=
nfiguring SDRAM at runtime, then you're likely pulling the rug out from und=
er the CPU=2E If you really must reconfigure at runtime, you'd probably hav=
e to have the code copy to SRAM, run out of SRAM, then jump back to SDRAM, =
but even that requires intimate knowledge of the memory layout in the kerne=
l, etc=2E And if you throw an MMU into the mix, it's even more complicated=
=2E=0D=0A=0D=0AI'd recommend recompiling dBug, or changing to another boot =
loader, such as u-boot=2E I like u-boot=2E=0D=0A=0D=0A-=0D=0Aallon=0D=0A=0D=
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