[ECOS] About compression and Decompression ???

[ECOS] About compression and Decompression ???

[sreenivas y.p.s.s]

Hi,
I have two  questions about compressoin and decompression in RedBoot

my question1:
How will i compress a image in RedBoot. Is there any command available ?

If at all the image is a compressed format, then using either 'load' or
'fis load' command we can decompress and put in to RAM.

But, I need to put compressed image in to flash. How can i do that?
using 'fis write' there is no option for to compress the image and put
in to flash.

my question2:
Generally, how much heap memory is required for a size of 1MB image to
be compressed using 'deflation ' Algorithm.

Thanks in advance.

Sreenivas

Re: [ECOS] About compression and Decompression ???

[Jesper Skov]

>>>>> "sreenivas" == sreenivas y p s s <sreenivas@multitech.co.in> writes:

sreenivas> Hi, I have two questions about compressoin and
sreenivas> decompression in RedBoot

sreenivas> my question1: How will i compress a image in RedBoot. Is
sreenivas> there any command available ?

No.

sreenivas> If at all the image is a compressed format, then using
sreenivas> either 'load' or 'fis load' command we can decompress and
sreenivas> put in to RAM.

sreenivas> But, I need to put compressed image in to flash. How can i
sreenivas> do that?  using 'fis write' there is no option for to
sreenivas> compress the image and put in to flash.

Compress the image before downloading it to the target.

sreenivas> my question2: Generally, how much heap memory is required
sreenivas> for a size of 1MB image to be compressed using 'deflation '
sreenivas> Algorithm.

I think the gunzip algorithm has a fixed overhead of something like
64kB.

Jesper