[U-Boot] [PATCH 2/2][v2] Add readme of how to boot from espi flash for p4080ds.

[Wolfgang Denk]

Dear Shaohui Xie,

In message <1289897403-24602-1-git-send-email-b21989 at freescale.com> you wrote:
>
> +The P4080 is capable of booting from SPI. The bootup process can be divided into
> +two stages: the first stage will load RCW and write configuration registers to
> +initialize SPI interface, and configure one CPC as 1M SRAM, and loads U-boot image
> +to CPC. The second stage will configure all the hardware and boot up to U-Boot
> +command line.
> +
> +The PBL image contains three parts, the first is RCW, the second is PBI commands
> +performs configuration registers write, the third is the 512KB u-boot image. The
> +PBL image is produced by tool pbl_image_tool.html.

Please explain abbreviations. What's PBI? CPC? 

What is "pbl_image_tool.html"?  I doubt that a HTML page can be used
as tool?

And where can this tool be found?  And why is it not part of the
U-Boot distribution?

> +1. Producing RCW
> +Copy RCW of u-boot dump and paste it to tab "Tools" of the tool and choose
> +"Boot" and change PBI_SRC to "0b0101 - SPI 24b Addressing", change BOOT_LOC to

You really mean one has to go to some web page and manually copy and
paste information there?

To build some image?

May I ask how you do automatic regression testing?

> +2. Producing ACS File

What is ACS?

> +	make P4080DS_PBL_BOOT_INDIRECT_config
> +	make CROSS_COMPILE=powerpc-none-linux-gnuspe- all
> +	xxd u-boot.bin > u-boot.xxd

> +3. Producing PBI commands
> +Switch to tab "PBI" and paste commands below into text field (please note these
> +commands are for CPC1 used as SRAM only, change corresponding register setting
> +if CPC2 need to be used as SRAM), then choose "ACS File (XXD Object Dump)",
> +change Offset to "f80000", and click "Browse" to select the u-boot.xxd file
> +produced in step 2, and click "Add PBI Data", after it finished, paste
> +"09138000 00000000" and "091380c0 00000000" at the end.

This must be a bad joke.

Can you not provide a plain and simple AUTOMATIC way to get this
result? some plain stupid command line tool? Something that works as
a simple "make XXX" ?  So it can be scripted / automatized / used?

Best regards,

Wolfgang Denk

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