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Re: [ts-7000] Re: Creation of a 7800 bootable SD card

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Subject: Re: [ts-7000] Re: Creation of a 7800 bootable SD card
From: "Michael Schmidt" <>
Date: Wed, 9 Jan 2008 11:19:34 -0700 (MST)
On Wed, January 9, 2008 11:11 am, phrasky wrote:
> Hi Michael,
>
> so the partitions 1,2,3 have to be 4MB at all times?

No, there isn't any reason why they can't be a different size.  But of
course they need to be large enough to hold the images you want to put on
them.

(Note: partition 1 on the 7800 is different from partition 1 on earlier
boards... it is a VFAT partition for ease of transfering files to/from
windows e.g. using eclipse.  But on the 512MB SD cards this partition is
only 4MB; only the 2GB SD cards it is much larger, and contains
documentation and whatnot.

> Would it be possible to create own MBR and so for example have only
> three patitions, with kernel, init ramdisk and rootfs, with any size
> split?

There is something about the way everything got set up that I think would
cause this to fail, but I don't remember off the top of my head what it
is.  On older boards the bootrom would just look at partition types.  But
for the 7800 you should have part1=don't care, part2=kernel (type 0xda),
part3=initrd (type 0xda), part4=rootfs.

>
> Best regards,
>
> Petr


 ______   Best Regards,
|__  __/                  Michael Schmidt
   ||                   Software Engineer
   ||echnologic Systems (EmbeddedARM.com)
   || (480)    16610 East Laser Drive #10
   |/ 837-5200   Fountain Hills, AZ 85268
       http://oz.embeddedarm.com/~michael



 
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