There have been several builds of the Balloon3 boards:

Prototypes P1 and P2

Build E1

Here we describe how to tell which you've got and the differences that might matter to you.

Memory

There are 8 chips in the schematic but only 6 fitted on boards so far.

Physically laid out like this: (power connector in top LH corner)

LH chip

RH chip

Bank number

U17

U23

Bank 3

U16

U22

Bank 2

This row is never fitted

U15

U21

Bank 1

U14

U20

Bank 0

This row not fitted on P1 P2

On P1 and P2 Because Bank 0 isn't fitted a bodge wire is added on the back to make Bank3 into Bank 0

P1 and P2 have 64Mbyte per bank - 16M x 16 bits (256Mbit) per chip - marked K4S561633F

E1 has 128 Mbyte per bank - 32M x 16 bits (512Mbit) per chip - marked K4M511633C

Memory map

The pxa has two memory layouts 'small' and 'large'. Large allows for more than 256 MB of RAM. They are laid out as follows:

Bank size

Bank

Address

small

64MB

0

0xA000

64MB

1

0xA400

64MB

2

0xA800

64MB

3

0xAC00

Bank size

Bank

Address

large

256MB

0

0x8000

256MB

1

0x9000

256MB

2

0xA000

256MB

3

0xB000

Balloonboard: Balloon3BuildVariants (last edited 2009-02-22 21:00:20 by localhost)