Pull up following revision(s) (requested by andvar in ticket NetBSD#71):

	share/man/man4/viaide.4: revision 1.13
	sys/dev/pci/viaide.c: revision 1.105

viaide(4): add UDMA support for VT8233C IDE controller.

The VT8233C is another obscure VIA southbridge and appears to be a
variant of the
VT8233 rather than the VT8233A (which supports ATA133). The C variant
was paired with
a 3Com network controller instead of VIA's own NIC. Detect the ISA-PCI
bridge and
enable UDMA100 capability for improved IDE performance.

Update the viaide(4) man page and refine the list of supported VIA controllers.

Author: MartinHusemann

share/man/man4/viaide.4

@@ -1,4 +1,4 @@
-.\"	$NetBSD: viaide.4,v 1.12 2025/04/21 20:37:48 andvar Exp $
+.\"	$NetBSD: viaide.4,v 1.12.2.1 2025/10/26 12:44:46 martin Exp $
 .\"
 .\" Copyright (c) 2003 Manuel Bouyer.
 .\"
@@ -22,7 +22,7 @@
 .\" INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd April 21, 2025
+.Dd October 17, 2025
 .Dt VIAIDE 4
 .Os
 .Sh NAME
@@ -45,11 +45,11 @@ Advanced Micro Devices AMD-756, 766, 768 and CS5536 IDE Controllers
 NVIDIA nForce, nForce2, nForce2 400, nForce3, nForce3 250,
 nForce4, MCP04, MCP55, MCP61, MCP65, MCP67 IDE and SATA Controllers.
 .It
-VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A, VT8233A,
-VT8235, VT8237/VT8237R/VT6420, VT8237A, VT8237S, VT8251, VT8261, CX700(M/M2),
-VX700, VX800/820, VX855/875, VX900/VX11 Integrated IDE and SATA Controllers,
-VT6415/VT6330 single-channel IDE Controllers, VT6410 IDE RAID Controller, and
-VT6421 SATA RAID & IDE Controller.
+VIA Technologies VT82C586, VT82C586A, VT82C586B, VT82C596A, VT82C596B,
+VT82C686A, VT82C686B, VT8233, VT8233A, VT8233C, VT8235, VT8237/VT8237R/VT6420,
+VT8237A, VT8237S, VT8251, VT8261, CX700(M/M2), VX700, VX800/820, VX855/875,
+VX900/VX11 Integrated IDE and SATA Controllers, VT6415/VT6330 single-channel IDE
+Controllers, VT6410 IDE RAID Controller, and VT6421 SATA RAID & IDE Controller.
 .El
 .Pp
 The 0x0002 flag forces the

sys/dev/pci/viaide.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: viaide.c,v 1.103 2025/06/01 15:56:43 andvar Exp $	*/
+/*	$NetBSD: viaide.c,v 1.103.2.1 2025/10/26 12:44:47 martin Exp $	*/
 
 /*
  * Copyright (c) 1999, 2000, 2001 Manuel Bouyer.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: viaide.c,v 1.103 2025/06/01 15:56:43 andvar Exp $");
+__KERNEL_RCSID(0, "$NetBSD: viaide.c,v 1.103.2.1 2025/10/26 12:44:47 martin Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -590,6 +590,10 @@ via_chip_map(struct pciide_softc *sc, const struct pci_attach_args *pa)
 				aprint_normal("VT8233A ATA133 controller\n");
 				sc->sc_wdcdev.sc_atac.atac_udma_cap = 6;
 				break;
+			case PCI_PRODUCT_VIATECH_VT8233C:
+				aprint_normal("VT8233C ATA100 controller\n");
+				sc->sc_wdcdev.sc_atac.atac_udma_cap = 5;
+				break;
 			case PCI_PRODUCT_VIATECH_VT8235:
 				aprint_normal("VT8235 ATA133 controller\n");
 				sc->sc_wdcdev.sc_atac.atac_udma_cap = 6;