Bitter news for some CyanogenMod fans. The developers of the popular custom Android ROM have announced that devices powered by a first generation Qualcomm Snapdragon S1 SoC — phones like the Nexus One, for example — will not be eligible for an upgrade to CyanogenMod 9. Slashgear reports that the CyanogenMod team ran afoul of the Snapdragon S1's hardware limitations, citing limited internal memory and poor compatibility with new APIs introduced in Android 4.0. While the developers claim that it would be possible to get Ice Cream Sandwich and Jellybean up and running, doing so would require a great deal of effort, and risk endangering the CyanogenMod platform's stability. Enterprising users who must have the latest version of Android on their aging devices are instructed to look "in the usual places" for ROMs that will suit their needs. For those with compatible devices, CyanogenMod 9 updates the ROM to Android 4.0, while those without will be limited to the Android 2.3-based CyanogenMod 7. You can find the full list of affected devices on CyanogenMod's announcement.