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How to Find the Silicon Revision of your OMAP35x or AM/DM37x
Contents
Intro[edit]
This info can be used for a couple different uses:
- Determining at run-time whether the target is OMAP35x or AM/DM37x
- Determining the silicon revision at run-time
Having this information allows software engineers to create a single binary capable of running on several different devices. At run-time the code can intelligently decide whether certain features are available or whether certain bugs need to be worked around.
How[edit]
Using your favorite memory probing tool, read back a 32 bit word from the CONTROL_IDCODE Register at address 0x4830 A204:
Table 1. OMAP35xx
| Silicon Revision | 32bit readback value |
| ES1.0 | 0x0B6D 602F |
| ES2.0 | 0x1B7A E02F |
| ES2.1 | 0x2B7A E02F |
| ES3.0 | 0x3B7A E02F |
| ES3.1 | 0x4B7A E02F |
| ES3.1.x | 0x7B7A E02F |
Table 2. AM/DM37xx
| Silicon Revision | 32bit readback value |
| ES1.0 | 0x0B89 102F |
| ES1.1 | 0x1B89 102F |
| ES1.2 | 0x2B89 102F |
Example[edit]
On Linux[edit]
Use the memory dump capability of u-boot from a standard PSP Linux Release:
OMAP3EVM #md 0x4830A204 1 4830a204: 2b7ae02f /.z+
From the read back value: 2b7ae02f, you can see the revison of this OMAP35x corresponds to ES2.1
On WinCE[edit]
Similarly, in a WinCE command prompt or Platform Builder shell:
Windows CE>in32 4830A204 4830a204: 4b7ae02f
From the read back value: 4b7ae02f, you can see the revison of this OMAP35x corresponds to ES3.1
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