ok, I can make your ramdisk "run" faster after boot
and not "boot" faster.
Try Initramfs, a very good replacement for ramdisk
ramdisk actually is a proper block driver assuming
memory as a storage medium; all overheads of block
device access are present.Also, the size is limited;
you cannot make it large if needed
Files in Initramfs are stored in kernel cache with a
very quick access time. Also, you need not specify the
size of the initramfs; it grows and shrinks as needed
Try it out, it's a good design choice
--- Andy Ngo <[EMAIL PROTECTED]> wrote:
> Thanks. Is the same true for the kernel image?
> Let's say that space on the NOR flash is not an
> issue; if I have an uncompressed kernel image (I
> believe uImage is compressed now), will it boot a
> little faster?
>
> Thanks.
>
> Regards,
> Andy
>
> ----- Original Message ----
> From: Andrew Armstrong <[EMAIL PROTECTED]>
> To: Andy Ngo <[EMAIL PROTECTED]>
> Cc: Roberto Waltman <[EMAIL PROTECTED]>;
> "davinci-linux-open-source @linux.davincidsp.com"
> <davinci-linux-open-source@linux.davincidsp.com>
> Sent: Friday, August 10, 2007 8:14:37 AM
> Subject: Re: Not having to copy ramdisk.gz from
> flash to RAM
>
> Andy,
>
> Through my own tests, I find a large uncompressed
> image copy is way way
> faster than a compressed one with a decompress
> stage.
>
> It is worth doing if you can fit it in your NOR.
> (make sure you se cp.l
> rather an cp.b in UBOOT!)
>
> Regards,
>
> Andrew
>
> On Fri, 2007-08-10 at 08:10 -0700, Andy Ngo wrote:
> > Thanks for the response. That makes sense. Short
> of hacking the
> > kernel to do what I want, I just have to stick
> with this and find
> > other ways of improving the boot up time. If I
> use a non-compressed
> > image (ramdisk instead of ramdisk.gz), will it buy
> me much time? By
> > that I mean copy time < uncompressing time?
> >
> > Thanks.
> >
> > Regards,
> > Andy
> >
> > ----- Original Message ----
> > From: Roberto Waltman
> <[EMAIL PROTECTED]>
> > To: "davinci-linux-open-source
> @linux.davincidsp.com"
> > <davinci-linux-open-source@linux.davincidsp.com>
> > Sent: Friday, August 10, 2007 7:48:55 AM
> > Subject: Re: Not having to copy ramdisk.gz from
> flash to RAM
> >
> > Andy Ngo wrote:
> > > ...
> > > ... Why does the ramdisk.gz image have to be in
> RAM first; isn't the
> > > kernel going to "uncompress" it to another part
> of RAM anyways; if
> > so,
> > > why can't it "uncompress" the ramdisk.gz
> directly from flash to
> > RAM ...
> > My answer is only an "educated guess", treat it
> accordingly. I assume
> > that is to make the kernel and booting process
> more simple and
> > consistent by dealing with one case only:
> ramdisk.gz is already in
> > memory, expand it an use it from here.
> >
> > Otherwise the kernel would have to know how to
> directly handle any one
> > of today's various memory architectures, plus
> anything the future may
> > bring.
> > For example, the ramdisk image could be stored in
> NOR FLASH chips,
> > ("plain memory", address + data), NAND FLASH
> chips, (more of a block
> > device, you provide commands and read/write blocks
> of data), I2C
> > EEPROMS
> > (read a bitstream), etc.
> >
> > It makes sense from a design perspective to have
> the bootloader, (that
> > needs to be customized for a particular hardware
> platform anyhow,)
> > take
> > care of these hardware related details and provide
> a more a uniform
> > environment for the kernel start-up.
> >
> >
> > Roberto Waltman
> >
> >
> > _______________________________________________
> > Davinci-linux-open-source mailing list
> > Davinci-linux-open-source@linux.davincidsp.com
> >
>
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
> >
> >
> >
> > _______________________________________________
> > Davinci-linux-open-source mailing list
> > Davinci-linux-open-source@linux.davincidsp.com
> >
>
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> >
>
>
>
>
>
> > _______________________________________________
> Davinci-linux-open-source mailing list
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>
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