Intel SR1690WB Service Guide - Page 92

Table 9. POST Progress Code LED Example 8h 4h 2h 1h 8h 4h 2h 1h Status ON OFF ON OFF ON OFF ON OFF Results 1 0 1 0 1 1 0 0 Ah Ch • Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated as ACh. Table 10. Diagnostic LED POST Code Decoder Diagnostic LED Decoder Checkpoint 1 = On, 0= Off Description Upper Nibble Lower Nibble MSB LSB 8h 4h 2h 1h 8h 4h 2h 1h LED #7 #6 #5 #4 #3 #2 #1 #0 Host Processor 0x10h 0 0 0 1 0 0 0 0 Power-on initialization of the host processor (bootstrap processor) 0x11h 0 0 0 1 0 0 0 1 Host processor cache initialization (including AP) 0x12h 0 0 0 1 0 0 1 0 Starting application processor initialization 0x13h 0 0 0 1 0 0 1 1 SMM initialization 0x14h 0 0 0 1 0 1 0 0 Selection of Processor with least feature use as Boot Strap Processor 0x15h 0 0 0 1 0 1 0 1 Switch an AP processor to become the new Boot Strap Processor Chipset 0x21h 0 0 1 0 0 0 1 0 Initializing a chipset component Memory 74 Intel® Server System SR1690WB Service Guide