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<TITLE>Int 1A/AX=B10Ah/SF=1022h
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Int 1A/AX=B10Ah/SF=1022h - PCI BIOS v2.0c+ - READ CONFIGURATION DWORD (AMD devices) -
AX = B10Ah subfn 1022h
BH = bus number
BL = device/function number (bits 7-3 device, bits 2-0 function)
DI = register number (0000h-00FFh) (see #00878)
Return: CF clear if successful
ECX = dword read
CF set on error
AH = status (00h,87h) (see #00729)
EAX, EBX, ECX, and EDX may be modified
all other flags (except IF) may be modified
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<h2>Int 1A/AX=B10Ah/SF=1022h
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<h3><font color=#C00040>PCI BIOS v2.0c+ - READ CONFIGURATION DWORD (AMD devices)</font></h3>
<PRE>
AX = B10Ah subfn 1022h
BH = bus number
BL = device/function number (bits 7-3 device, bits 2-0 function)
DI = register number (0000h-00FFh) <a href="rb-2377.htm#Table878" tppabs="http://www.ctyme.com/intr/rb-2377.htm#Table878">(see #00878)</a><br>
<p><b>Return:</b><br>CF clear if successful
ECX = dword read
CF set on error
AH = status (00h,87h) <a href="rb-2371.htm#Table729" tppabs="http://www.ctyme.com/intr/rb-2371.htm#Table729">(see #00729)</a>
EAX, EBX, ECX, and EDX may be modified
all other flags (except IF) may be modified
</PRE>
<p><b>Notes:</b>
This function may require up to 1024 byte of stack; it will not enable
interrupts if they were disabled before making the call.
The meanings of BL and BH on entry were exchanged between the initial
drafts of the specification and final implementation
<p><b>See Also:</b>
<a href="rb-2377.htm" tppabs="http://www.ctyme.com/intr/rb-2377.htm">AX=B10Ah</a> - <a href="rb-2382.htm" tppabs="http://www.ctyme.com/intr/rb-2382.htm">AX=B10Ah/SF=1042h</a> - <a href="rb-2387.htm" tppabs="http://www.ctyme.com/intr/rb-2387.htm">AX=B10Ah/SF=8086h</a>
<PRE>
<p>
Format of AMD Am53C974A PC-SCSI PCI configuration data:
<a name=table925></a>
Offset Size Description (Table 00925)
00h 64 BYTEs header <a href="rb-2377.htm#Table878" tppabs="http://www.ctyme.com/intr/rb-2377.htm#Table878">(see #00878)</a>
(vendor ID 1022h, device ID 2020h)
10h DWORD I/O base address (see PORT xxxxh"Am53C974A")
40h 16 BYTEs scratch registers
(used by AMD's PC-SCSI drivers as follows:
40h/41h SCSI configuration register 0 <a href="javascript:if(confirm('http://www.ctyme.com/intr/rb-0000.htm \n\nThis file was not retrieved by Teleport Pro, because it was unavailable, or its retrieval was aborted, or the project was stopped too soon. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/intr/rb-0000.htm#Table0'" tppabs="http://www.ctyme.com/intr/rb-0000.htm#Table0"></a>(see #00926,#00927)
...
4Eh/4Fh SCSI configuration register 7)
</PRE>
<p><b>See Also:</b>
#00747
<PRE>
<p>
Bitfields for AMD Am53C974A Target Device Configuration Register:
<a name=table926></a>
Bit(s) Description (Table 00926)
15-14 reserved
13 "FSCSI" Fast SCSI drive is present
12-8 "SPD" synchronous period
7-4 synchronous offset (0 = asynchronous transfers)
3-1 SCSI bus status
0 target device is present and active.
If 0, all other bits must be cleared to zero for target devices
</PRE>
<p><b>See Also:</b>
#00925 - #00927
<PRE>
<p>
Bitfields for AMD Am53C974A Host Configuration Register:
<a name=table927></a>
Bit(s) Description (Table 00927)
15-9 reserved
8 SCSI bus has been reset
7 starting BIOS number (bits 6-4) is valid
6-4 starting BIOS number (000 = BIOS drive 80h, 001 = drive 81h, etc)
3 this device is a SCSI host
2 protected-mode driver initialized
1 real-mode driver initialized
0 target device present.
=0 indicates that this is a host if bit 3 is set
</PRE>
<p><b>See Also:</b>
#00925 - #00926
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