Отправлено 19 Июнь 2014 - 23:52
а какая-нибудь мать на 865/875 с поддержкой 775 работает с 4 ядрами?
если кому-нибудь интересно, вот вся последовательность для включения isa:
b. On power-up reset (i.e., cold boot), the NOGO signal is high on reset and therefore disables the subtractive decoding capability of pci-isa bridge. Any other GPO pin which is high on reset can also be used.
d. Enable serial IRQ in continuous mode, 21 frames and 4 clock start frame by setting register 64h of south bridge to d0h. (In the old south bridge, the serial IRQ pin is multiplexed with a GPIO and need to be selected as serial IRQ. In the latest industry standard south bridge, however, the serial IRQ is a dedicated pin and does not require initialization.)
e. Enable PC/PCI DMA by setting the PC/PCI request and grant pins to PC/PCI DMA mode, instead of using them as GPIOs. Any PC/PCI request and grant pair can be used, but on the south bridge, GNT[B] is multiplexed with GNT[5], so PC/PCI request and grant pair A is more preferable to use.
Set all channels of DMA to PC/PCI DMA except for channels 4 & 2 (channel 4 is for cascading the DMAC and channel 2 is for FDC). The value to be put in register 91:90 is 5475 for the latest south bridge and 5455 for older south bridges. The difference is due to the use of “11” for LPC DMA, and the value of 00 (ISA DMA) being put into reserved instead.
f. Enable positive decode for the devices under the new south bridge: program the value of 3C0F into reg. E7:E6 will enable positive decode for most devices except sound and gameport. (здесь надо наоборот, т.к. интересует только звук и гей-порты)
h. Set the NOGO signal to low.
i. тут программирование регистов моста. у каждого свои
j. Program a value of 03 into register D3h of device 1Fh in function 0 of the new south bridge. This will prevent the isa bridge from responding to configuration accesses afterwards. The rationale for doing this is to prevent Windows from detecting two ISA bridges, the other one being the PCI-to-LPC bridge, and thus creating a conflict.
After this, proceed in normal BIOS flow. Note that step d to j must be performed before ISA bus enumeration, and therefore before ISA plug and play initialization and option ROM checking. This is needed for plug and play cards and cards with option ROM (e.g.,VGA cards, SCSI cards) to work properly
я это делал в досе, но несмотря на предупреждение что для pnp устройств надо это делать до isa enumeration, awe64 заработал