Sun Archive BOOTROM Page
How to use:
> q loc - will let you change the byte value at loc.
> q [ret] - will step you through the locations, letting you change them
as you go. A q by itself will exit you back to the > prompt.
Here are some important locations and possible contents:
0x000-0x003 - Diagnostic Test Write Area (used by diagnostics) 4 bytes
0x004-0x009 - Diagnostic Area Write Counters (used by diagnostics) 6 bytes
0x00c-0x00e - Diagnostic Area Checksum *used by daignostics) 3 identical bytes
0x010-0x013 - Date of Last System Hardware Update (Total seconds since 1/1/70)
0x010 - bits 31-24
0x011 - bits 23-16
0x012 - bits 15-8
0x013 - bits 7-0
0x014 - Total number in hex of installed memory in the system. 1 byte
0x015 - Total number of MB (in hex) to test prior to booting.
Firmware ignores this value if diagnostic switch set to DIAG.
1 byte.
0x016 - Monitor Screen Size (1 byte)
Set to:
0x00 for 1152x900 (Most Sun-3 Systems)
0x12 1024x1024
0x13 1600x1280 (HiRes for Sun 3/200 series)
0x14 1440x1440
0x15 1024x768 (low resolution)
0x017 - Watchdog Reset Action (1 byte)
Set to:
0x00 Watchdog Reset will fall into Boot PROM Monitor
0x12 Watchdog Reset will cause a Power On Reset
0x018 - Operating System Boot Up (1 byte)
Set to:
0x00 Poll devices for the SunOS (i.e., xy, sd, etc)
0x12 Use EEPROM specified boot device
0x019-0x01d - Boot device (the one you wanted! - 5 bytes)
0x019-0x01a Default boot device (see table below)
0x01b Controller number in hex
0x01c Unit number in hex
0x01d Partition number in hex
Table for 0x019-0x01d:
OS Boot Device: Ox019: 0x01a:
xy: Xylogics 450/451 disk 0x78 0x79
xd: Xylogics Disk (7053) 0x78 0x64
sd: SCSI disk (!) 0x73 0x64
ie: Intel Ethernet 0x69 0x65
le: AMD (Lance) Ethernet 0x6c 0x65
st: SCSI 1/4" Tape 0x73 0x74
xt: Xylogics 1/2" Tape 0x78 0x74
mt: Tapemaster 1/2" Tape 0x6d 0x74
(So if you want to boot a 3/50, 3/60, 3/75/140, 1/160/180, 3/110,
3/260, 3/280 or 3/80 from SCSI sd(0,0,0), set EEPROM locations
0x019-0x01d to 73 64 00 00 00.)
0x01e - Keyboard type (1 byte) Not implemented
0x01f - Primary Terminal (1 byte)
Set to:
0x00 Use B/W Monitor (monochrome on-board frame buffer)
0x10 Use Serial Port A
0x11 Use Serial Port B
0x12 Use Color Monitor (CG2, CG3, CG5, or color daughter board)
0x20 Use single of first head of multiheaded P4 board (CG6)
0x020 - Display Sun Banner (You can have the default Sun logo or
a custom logo) (1 byte)
Set to:
0x00 Display the Sun Banner
0x12 Display Custon Banner
0x021 - KeyClick on/off (1 byte)
Set to:
0x00 Turn Click OFF
0x12 Turn Click ON
0x022-0x026 - Diagnostic Boot Device (5 bytes)
(See Boot device table above)
0x028-0x04f - Diagnostic boot path (40 bytes) in ASCII.
0x050 - HiRes Screen Size
# of columns (default 0x50 is hex for 80 columns)
# of columns (0x78 is hex for 120 columns)
0x051 - HiRes Screen Size
# of rows (default 0x22 is hex for 34 rows)
# of columns (0x30 is hex for 48 rows)
0x058 - SCC Port A Default Baud Rate (1 byte)
Set to:
0x00 Use Default Baud Rate of 9600 baud
0x12 Use EEPROM defined baud rate (see below)
0x059-0x05a - SCC Port A Baud Rate (2 bytes)
Table:
Baud Rate: Hex Equiv: 0x059: 0x05a:
300 0x012c 0x01 0x2c
600 0x0258 0x02 0x58
1200 0x04b0 0x04 0xb0
2400 0x0960 0x09 0x60
4800 0x12c0 0x12 0xc0
9600 0x2580 0x25 0x80
19200 0x4b00 0x4b 0x00
38400 0x9600 0x96 0x00
(Note: SunOS 4.1.1 apparently ignores what you set when it comes
to configuring the serial ports, so this isn;t as important as it looks.)
0x05b - SCC Port A DTR/RTS (1 byte)
Set to:
0x00 Assert the DTS and RTS signals
0x12 Do NOT assert the DTS and RTS signals
0x060 - SCC Port B Default Baud Rate (1 byte)
0x061-0x062 - SCC Port B Baud Rate (2 bytes)
0x063 - SCC Port B DTR/RTS (1 byte)
(see table and infor for Port A, above)
0x068-0x0b7 - Custom Banner (80 bytes)
These 80 bytes represent a character buffer for a user
specified custom banner to be displayed instead of the
Sun banner, when the value of EEPROM location 0x020 is
0x012. All locations up to the terminator (0x00) are
displayed; each byte not filled with the hexadecimal
equivalent of an ASCII character should contain zeroes.
0x0b8-0x0b9 - Test Pattern (2 bytes)
These two bytes are used to provide a known data test pattern
to check the EEPROM data lines.
0x0b8 is 0xAA
0x0b9 is 0x55
0x492 - Password Mode Select (ROM Rev. > 2.7.0)
0x5E = fully secure mode
0x01 = command secure mode
Rest = non-secure mode
0x493-0x49a - Password Bytes (ROM Rev. > 2.7.0)
8 Bytes of password in ASCII
If the PROM Rev. level is 2.8, enter a @ character before
each letter of the password. Enter one letter before each
location, followed by . If the password is less than
8 letters, enter 00 in the remaining locations. The HEX-Value
of the letters can also be used to enter the password.
0x70b - Sun 3/80 Power-On Mode
0x06 = normal boot
0x12 = diagnostic mode
Rest = full diagnostic boot