[U-Boot] Wandboard: u-boot.img is getting too large

[Wolfgang Denk]

Dear Alexey,

In message <1467694422.3144.32.camel at synopsys.com> you wrote:
> 
> According to http://wiki.wandboard.org/index.php/Boot-process#sdcard_boot_data_layout
> Wandboard's SD-card layout is as follows:
> ------------------------------>8---------------------------
> #  Offset (hex) (dec)   Description
> ==========================================================
> 1. 0x00000000		Reserved For MBR
> 2. 0x00000200	512	Secondary Image Table (optional)
> 3. 0x00000400	1024	uBoot Image (Starting From IVT)
> 4. 0x00060000	393216	start of uboot env (size:8k)
> 5. 0x00062000		end of uboot env
> 6. 0x00100000	1048576	Linux kernel start
> 7. 0x0076AC00	7777280	start of partition 1

So they reserve 383 KiB for U-Boot, 8 kB for the environment, and then
leave an unused gap of 632 KiB?  That's silly.

> IMHO there's an obvious solution for all that - just move U-Boot's env for say
> another 300-400k above like that:

Why place the environment anywhere in the middle of that free space?
Just move it to the very end of it, i. e. make it

   Offset	Size	  Usage
1. 0x00000000	 512 B	  Reserved For MBR
2. 0x00000200	 512 B	  Secondary Image Table (optional)
3. 0x00000400	1015 KiB  U-Boot image(s)
4. 0x000FE000	   8 KiB  U-Boot environment
6. 0x00100000	...	  Linux kernel

Then you have all options open to grow even further, if needed, or
allocate other stuff below the env without leaving a gap.

Gaps in a memory map are always begging for trouble, expecially when
there is no reason for them.

Best regards,

Wolfgang Denk

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