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Driver Parameter Details

Table 2: Driver parameter details.

Driver Parameter Description

pci-burstsize

The PCI-X bus supports multiple data lengths (burst

size). Use the following values when adjusting this

parameter.

pci-burstsize = 0;

pci-burstsize = 512;

pci-burstsize = 1024;

pci-burstsize = 2048;

Setting pci-burstsize to 0 will result in using the

system default burst size. Some systems do not

support burst sizes greater than 512 bytes. Setting

the burst size to more than 512 bytes on these

systems may result in problems such as PCI bus

hangs or data corruption.

*The AMD-8131 HyperTransport PCI-X chipset is

known to have issues on bus segments running at

133Mhz with large burst sizes and multiple split

transactions. It is recommended that the following

values be used for the PCI burst size and PCI split

transactions:

PCI Burst Size PCI Split Transactions

512 3

1024 2

2048 1

For additional information, please refer to the AMD-

8131 HyperTransport PCI-X Tunnel Revision Guide:

26310 Rev 3.08 August 2004, section 56.

pci-split-transaction-cnt

*see pci-burstsize for

important information regarding the

modification of this parameter.

The PCI-X bus supports multiple simultaneous data

transactions.

pci-split-transaction-cnt = 0;

pci-split-transaction-cnt = 1;

pci-split-transaction-cnt = 2;

pci-split-transaction-cnt = 3;

pci-split-transaction-cnt = 4;

pci-split-transaction-cnt = 8;

pci-split-transaction-cnt = 12;

pci-split-transaction-cnt = 16;

pci-split-transaction-cnt = 32;

Other values will generate a warning and the number

of split transactions will not be modified.

Setting pci-split-transaction-cnt to 0 will

result in using the system default burst size.

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