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3.3.6 Board ID Low-Byte Register (BIDL)
Table 30: Board ID Low-Byte Register (BIDL)
ADDRESS
BIT
7
NAME
ACCESS
RESET
BITFIELD
7
BIDL
Board identif ication:
AM4024:
AM4024E:
3.3.7 LED Conf iguration Register (LCFG)
The LED Configuration Register holds a series of bits defining the onboard configuration for the front
panel User-Specific LEDs.
Table 31: LED Configuration Register (LCFG)
ADDRESS
BIT
7
NAME
ACCESS
RESET
BITFIELD
3..0
User-Specif ic LED Conf iguration:
LCON
0000 = POST (ULEDs build a binary vector to display Port 80 signals)
0001 = Mode A (LEDs are controlled via the LCTRL register)
0010 = Mode B (default mode, function af ter boot-up)
0011 - 1111 = Reser ved
Regardless of the selected configuration, the User-Specific LEDs are used to signal a number of fatal
onboard hardware errors, such as:
ULED3:
Power failure (red)
ULED2:
Clock failure (red)
ULED1:
Hardware reset (red)
ULED0:
uEFI BIOS boot failure (red)
In POST mode, the ULED3..0 fulfill a basic debug function during the boot-up phase as long as the first
access to Port 80 is processed. For further information on reading the 8-bit uEFI BIOS POST Code, refer
to Chapter 2.7.1.2, User-Specific LEDs.
In Mode A, the ULEDs can be individually configured according to the application requirements (see
Chapter 3.3.8, LED Control Register).
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6
5
4
0x10 (AM4024) / 0x12 (AM4024E)
0xB410
0xB412
6
5
4
Reser ved
R
0000
0x28D
3
2
BIDL
R
DESCRIPTION
0x290
3
2
LCON
R/W
0000
DESCRIPTION
User Guide
AM4024(E)
1
0
1
0
46
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