AT91SAM9G20 design and boot times

[Aras Vaichas <arasv@magellan-technology.com>]

Hi,

we're designing our next generation RFID reader and I'm planning on
using the AT91SAM9G20 in the next design. We currently use the
AT91RM9200.

Can I get some feedback from people with regards to general design
configurations  that affect the boot time with respect to this CPU (or
the AT91SAM9260)

Some questions are:

* what is your boot time? What is the time from power-on to kernel
running, how long does the kernel take to run until init starts, and
how long does init take?
* what is your system hardware configuration? CPU+NAND, CPU+NOR+NAND,
CPU+DATAFLASH+NAND?
* do you boot everything from the NAND or do you use a combination of
Dataflash/NOR and NAND?
* do you use U-Boot, or a minimal custom bootloader that copies a
kernel image from NAND to SDRAM and then executes it?
* do you mount a small partition of the NAND to begin with and then
mount the rest later?
* do you have a monolithic kernel, or is it split into minimal with
modules loaded from, say, JFFS2 on NAND?
* are you using JFFS2 or UBIFS?

Any info is much appreciated, thank you!

regards,

Aras Vaichas