RadiSys Endura GL815E Product Manual

RadiSys Endura GL815E Product Manual Manual pdf 34 page image

GL815E Endura Motherboard Product ManualPage 34 of 514.4 BIOS Error IndicationsOnce the motherboard powers-up the BIOS code runs Power-On-Self-Test software to check thatthe motherboard is operating correctly. During this process, the code writes an 8-bit value to anerror port at various code checkpoints. If a fatal error is determined, then the error code indicatesthe last successful checkpoint reached. The BIOS will attempt to write this code to the display. Theerror port (I/O location 80h) can be read via “off-the-shelf” Debug cards. The table below lists thecheckpoint codes.There are a number of checkpoints that also generate an audible ‘beep’ code on failure using thestandard PC speaker (also routed though the motherboard audio system). The beep codes aremade up of up to 4 groups of short beeps and are also listed below.Once the video is enabled further errors generated during and after POST are sent to the videodisplay as text messages. These messages are always displayed unless the motherboard isconfigured for silent boot or headless (no keyboard, mouse or display) operation.BIOS POST Checkpoint Codes02h Verify Real Mode 6Ch Display shadow message03h Disable NMI 6Eh Display non-disposable segments04h Get CPU type 70h Display error messages06h Initialize system hardware 72h Check for configuration errors08h Initialize chipset registers with initialPOST values74h Test real-time clock09h Set in POST flag 76h Check for keyboard errors0Ah Initialize CPU registers 7Ah Test for key lock on0Bh Enable CPU cache 7Ch Set up hardware interrupts vectors0Ch Initialize cache to initial POST values 7Eh Test coprocessor if present0Eh Initialize I/O 80h Disable onboard I/O ports0Fh Initialize local bus IDE 81h Late device initialization10h Initialize Power Management 82h Detect and install external RS232 ports11h Load alternate registers with initialPOST values83h Configure IDE controller12h Restore CR0 84h Detect and install external parallel ports13h Reset PCI BM 85h Initialize PCI PCC devices14h Initialize keyboard controller 86h Re-initialize onboard I/O ports16h BIOS ROM checksum 87h Configure MCD devices17h Pre-size DRAM 88h Initialize BIOS Data Area18h 8254 timer initialization 89h Enable NMI1Ah 8237 DMA controller initialization 8Ah Initialize Extended BIOS Data Area1Ch Reset Programmable InterruptController8Bh Initialize mouse20h Test DRAM refresh 8Ch Initialize floppy controller22h Test 8742 Keyboard Controller 8Eh Execute auto-typing24h Set ES segment to register to 4GB 8Fh Hard disk controller fast pre-initialization