Morning,
These are both Ultra Sparc 3's, with Solaris 10U13 set up as a home IPF/NAT servers. One operational/one backup. These Bullfrog laptops are expanded to virtual desktop configuration having the bottom added cardcage installed to permit one full size board to be added.Uses a M48T59Y NVRAM chip with battery tophat snap on.
I ave full root access to both, and full access to OBP to do the usual boot params and the like. Units are both fully operational. The one with the "invalid IDPROM" will manually boot and function fine. Auto-boot fails due to IDPROM issue.

The OBP fcode is further limited missing idprom@, mkp, mkpl, attributes/properties, pgmap, mappg, commands, also eeprom access via within Solaris is not implemented, c! dump works. There maybe more fcode commands that work/or are missing. These are what I've come across so far.

My possible resolution thoughts:
1)With the eeprom access not implemented, is there a Solaris freeware like utility that can access NVRAM directly? Like a command line software tool that can search all memory, including NVRAM, for a set of bytes and allow those memory locations to be altered?

2) Is there an OBP source around that the mkp source can be used to manually fcode up in NVRAM

3)I thought of installing the earliest firmware hoping the mkp, eeprom, etc are available like the earlier Sun OBPs. Have not found any of the earlier firmwares so far.

4) I can remove/install the invalid NVRAM chip with battery externally attached allowing me to program in those corrupt 16 bytes and reinstalling. This is a pain in the ass though! I still need to find the exact physical locations.

---------- Post updated at 11:37 PM ---------- Previous update was at 09:37 AM ----------

Figured it out finally! BAM!

IDProm locations:
Bullfrog-1

Code:

FFF17A58 = 01	 Format
FFF17A59 = 80	 Type
FFF17A5A = 00	 Ethernet Addr
FFF17A5B = 00	 Ethernet Addr
FFF17A5C = 83	 EthernetAddr
FFF17A5D = D1 Ethernet Addr
FFF17A5E = 00	 Ethernet Addr
FFF17A5F = 8D	 Ethernet Addr
FFF17A60 = 00	 Date
FFF17A61 = 00	 Date
FFF17A62 = 00  Date
FFF17A63 = 00	 Date
FFF17A64 = D1	 Serial
FFF17A65 = 00	 Serial
FFF17A66 = F0	 Serial
FFF17A67 = 7F	 Checksum

OBP Commands:

Code:

FFF17A58 10 dump		displays 16 bytes
FFF17A58 C?  	                Displays content of address (is 01)
n FFF17A58 C!	 	        Store byte "n" in address
show-devices		        Find address of eeprom
			                IDProm 1000h below that

Calculate Checksum using Windows calculator in Programmer mode:
B is for Byte.

Code:

B1 xor B2 xor B3 xor B4 xor B5 xor B6 xor B7 xor B8 xor B9 xor B10 xor B11 xor B12.....B15 = B16