Publication No. PPC11A-HRM/1
Configuration 19
2.2
Inspection
The PPC11A is shipped from Abaco with no jumpers fitted.
2.3
Configuration Link Descriptions
NOTES
1.
Ordinary operation does not require any jumpers to be fitted.
2.
Software can read the states of most of the links from the
Jumper Link Status Register (offset 0x6CD)
TIP
If you are about to install your PPC11A and power-up for the first time, leaving it in the default configuration
will enable board operation to be proven before tackling any further configuration issues.
2.3.1 Boot Area Selection Link (P15 Pins 1 to 4)
The Boot Flash (for all processing cores) is divided into two sections, allowing for
three different boot images to be loaded into the Flash. There is also an Abaco-
programmed Recovery boot image, which is stored in a separate SPI Flash. These
links are used to select which image is used at boot time.
Table 2-1 P15 Pins 1 to 4 Jumper Functions
Pins 1 and 2 Pins 3 and 4 Active Boot Image
Out
Out
Main
In
Out
Alternate
Out
In
Recovery
In
In
Reserved
In normal operation, jumpers are not fitted on these links and the PPC11A boots
from the Main boot image.
NOTES
EEPROM DIP Switch 1 Register 1
, GPIO6 has the same effect, when asserted high, as
fitting a jumper on pins 1 and 2 (Boot Alternate) and/or GPIO7 has the same effect, when asserted high, as
fitting a jumper on pins 3 and 4 (Boot Recovery).
The Alternate boot image can also be selected directly using the
EEPROM DIP Switch 1 Register 1
.