Micro2440 at 533Mhz

hi,

How can i do for put micro2440 at 533Mhz ?

thx.

Hi,

I have already looked at this, but not started yet. It is normaly possible
to increase CPU speed by changing registers. Have a look at Samsung S3C2440
datasheet page 255 (7-21). The onboard quartz is a 12MHz one.
It should be possible to set clock speed at 532MHz with a 12MHz input
quartz by setting MDIV to 0x7D, PDIV=1 and SDIV=1.

I hope this helps, let us know!

on u-boot i have tested s3c24xx speed set 533 but after the board hang.

thx

Hi,

I've seen it was also possible to change CPU speed in supervivi, but not
tested, I don't know which parameters to set (I have also not searched! ;-)
)

Hi Screwface

Where did you find this ?

thanks

Dear Irinel,

I found that in supervivi commands (the last version). Press q to get the
command prompt and then help to get the list of the available commands.

I found a interesting source code here
http://blog.leshak.ru/file/cmd_s3c24xxc.gz

How can I run it without u-boot ?

thx

anyone has tested 533mhz on micro2440 256 MiB ?

for me , a board hang with u-boot

thx

Many people say that the overlocking process was successfully done on a lot
of PDAs based S3C2440 using ClockWizard.exe .

EHM! 

uboot: "help" command might tellya

its just 1 line to enter in uboot to overclock

the speed u can reach is mainly based on the quality of the board

Seppo

yes but how do i do ?

in supervivi i have this command

cpu <clock> <ratio>

what is the ration for micro2440 256MiB  tu put ?

cpu 533 ??

thans in advance.

any idea ?

For uboot 
Will list all the freq settings
s3c24xx speed list  

Will set the freq to 451Mhz
s3c24xx speed set 451


--fatbrain

fatbrain Did you try to overclock your cpu ? The board works fine after
overclocking ?

Any idea for vivi ?

Thanks

i have tested with command s3c24xx speed ... at 533 and the board hang.

thx.

I can boot the box upto 499 Mhz but then my apps start hanging.
The need for overclocking for me arose due to performance lag of QT 4.6.2


--fatbrain

i try to change the speed with command

s3c24xx 533 or 504 for example
savenv
reset

when i type a command s3c24xx speed get, i have always the same spped

FCLK = 405 MHz, HCLK = 101 MHz, PCLK = 50 MHz, UCLK = 48 MHz

??

the value is not in memory.

thanks in advance.

andromeda you have to set the speed in the bootcmd 

setenv bootcmd 's3c24xx speed set 451; tftpboot 0x31000000
192.168.1.2:uImage ; bootm 0x31000000'

and then do a saveenv

it works

--fatbrain

AFAIK if you increase the CPU speed, you also have to change the SDRAM
parameters to make it work. There is always a 1:4 ratio between the CPU
core clock and the SDRAM clock. If the SDRAM is configured to run with CL2
@ 100MHz (at 400MHz CPU core speed) you may have to change to CL3 @ 133MHz
to increase the CPU core frequency.

jbe

Is this safe? anyone is able to set the clock to the maximum without any
problem?

in theory it is safety because this is one of the standard speed of CPU I
don't know what happen with System but the CPU shouldn't damage

With vivi, i get this (cmd: cpu info)

Processor Information (Revision: 0x41129200)
--------------------------------------------
Processor clock: 405000000 Hz
AHB bus clock  : 101250000 Hz
APB bus clock  : 50625000 Hz

Register values
MPLLCON: 0x0007f021  (MDIV: 0x007f, PDIV: 0x02, SDIV: 0x01)
CLKDIVN: 0x00000005

How to use the cmd cpu set <clock> <ratio> ?

I try to use cpu set 500 1, but  i can't say yes after :

CPU Clock Change From 405 Mhz  To 500 Mhz 
?

Did anyone finally manage to overclock mini2440 to 533MHz ?

All S3C2440 CPU I have seen yet are rated for 400 MHz only. There is no
hint in the datasheet for 533 MHz any more.

U-Boot:
s3c24xx speed get
-> 405 Mhz

s3c24xx speed set 461 
-> maximum

i can get. It's the same problem as always with linked infrastructure, you
have one clock generator for the CPU and everything else linked to that
one. So if you increase your CPU clock, the other clocks will raise as well
(as Juergen mentioned the Ramclock) but also the periphal clock, i.e. the
way the soundcard or USB is linked. 

Basically there shouldn't be any damage, because you don't increase any
voltage, just the speed of the clockgen. But, you should be aware of more
heat produced by the chip which maybe can damage your board, if it's
located in a little black box and sweating in the summer sun ;)

cheers

Have you already changed the VDDCORE voltage to 1.3V before setting the
higher CPU clock rate ?

I tried with supervivi using commmand cpu set <freq> <ratio>. 

But i got error like " Cant find cpu freq table"

Is there any solution for the same ???