ASROCK AMD A620 Series Setup Manual page 66

Secondary PROM21 Chipset SI Configuration Options
Press [Enter] to configure PROM21 Chipset SI Configuration Options.
PROM21 Chipset Revision
Allows you to configure PROM21 Chipset Revision setting.
Configuration options: [Auto] [A1] [A2]
Dual PROM21 port number/disable
Allows you to set downstream port number for the second PROM21.
Configuration options: [Auto] [Disable] [Port 0] [Port 4] [Port 8]
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