Catalyst US15W D2 Stepping
Intel has released a new revision of the SCH US15W System Controller Hub (SCH). The SCH lies at the heart of the Catalyst module and other Eurotech Intel Atom products.
This change has the following impact:
- Some operating system builds may require one or more new drivers
- Some operating systems will detect a change in US15W revision as new hardware.
Identifying the Stepping
Revision D of the Catalyst Module features the D2 stepping of the US15W, while revision B modules use the D1. The difference between module revisions is easy to spot: Rev B modules use green soldermask, while rev D modules are blue.
On single-board products like the Proteus, you can identify the SCH US15W stepping by the markings on the chip itself (ref):- Step D1: SLB4U
- Step D2: SLGFQ
Operating System Changes
There are two ways this change affects the operating system:- New Driver Required
Some OS builds may not include the drivers necessary to support the updated chipset. Contact us if you need updated drivers if you are (1) replacing a rev B with rev D module or (2) need to update your BSP with the driver for the OS you are building.
- OS Detects New Hardware when Module Upgraded
If you booted an operating system with a US15W-D1 module, but then replace that module with a US15W-D2 module, the installed operating system may detect the D2 module as new hardware. Depending on the operating system and version loaded, you may need to take additional steps. Follow the instructions below to complete the driver update.
Here are additional OS-specific details:Windows Embedded Standard (WES), XP, XPe
- The D2 stepping requires the driver usbui.dll, which is not included in some ISIS/XPe and Proteus/XPe builds.
- The current drivers from Intel are unsigned, which triggers the prompts when the "new" hardware is detected, rather than installing the updates automatically.
Windows CE
CE does not make a distinction between the D1 and D2 steps.
Related Documents
- PCN09001: Catalyst Module Rev D changes
- Windows Embeded Standard (WES) Upgrade Procedure (110122-2013)
- Caution: Removing and Installing Modules (topic 2778)
Edited by akidder 10-Jun-09: Added details about identifying stepping, links to PCN, link to WES update procedure |
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Catalyst US15W D2 stepping product notice
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Posted - 27 Apr 2009 : 17:54:39
