Re: Could the DTS experts look at this?

On Sun, Feb 10, 2008 at 10:49:55PM -0500, Sean MacLennan wrote:

David Gibson wrote:

quoted

On Sun, Feb 10, 2008 at 09:40:19PM -0500, Sean MacLennan wrote:
  

quoted

David Gibson wrote:
    

quoted

This doesn't seem right.  warp_fixup_one_nor() changes only the
partition's offset, so you're not changing the size of any
partitions.  If you're not going to actually use any of the extra
flash space with 64M, I can't see why you'd bother moving around the
partitions you have.
  
      

u-boot must be at the bottom of the flash. Also, for the 64M NOR flash 
you can put everything in the NOR flash, I just don't show the 
partitions. Booting from NOR is *much* faster than  booting from
NAND.
    

Sorry, still not really following what's going on.  Without worrying
about the dts formatting or fixup code, can you summarise what the two
flash maps look like?

  

I guess what is confusing is that I am actually working with 3 flash 
maps right now, although there will only be one map in the final version.

Map1:

NOR:
  Kernel @ 0
  Ramdisk
  User
  FPGA
  Env
  U-boot @ 63.5M

Map 2:

NOR:
  FPGA
  Env
  U-boot @ 63.5M
NAND:
  Kernel @ 0
  Ramdisk
  User

Map 3:
  Same as Map 2 only 4M NOR rather than 64M, so u-boot @ 3.5M.

But the partitions are all the same size, so in Map 2 there's a great
big gap between Env and U-boot?  Or there's a great big gap before
FPGA?

The u-boot, env, and FPGA are anchored at the bottom of the flash. 
Kernel is anchored at the top. Everything else goes in the middle.

Um.. so "bottom" actually means "high addresses" in the above?

The FPGA partition contains the FPGA image. The user partition contains 
a persistent JFFS2 file system. I don't use the user partition, so it 
doesn't show up in the map I sent.

So map 1 was used until we got the NAND working. Map 2 is an interim 
solution until we get the 4M flash. Map 3 is the final version.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson