I believe the serial capability on the HTC phones requires a kernel recompile, though the code is there and only needs to be enabled in the kernel config. For the MSM7201 based phones (G1/Magic/Hero) USB host is also a possibility with a kernel recompile after applying an unofficial patch.
Of everything listed, I think USB host on the droid is the only capability available on a device as delivered to consumers, everything else requiring rooting and reflashing.
There's a high probability of other vendor's devices using the same processor as the listed ones to also have these capabilities - especially for USB, maybe less so for serial.
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我相信 HTC 手机上的串行功能需要重新编译内核，尽管代码已经存在并且只需要在内核配置中启用。对于基于 MSM7201 的手机 (G1/Magic/Hero)，USB 主机也可以在应用非官方补丁后重新编译内核。
在列出的所有内容中，我认为 droid 上的 USB 主机是交付给消费者的设备上唯一可用的功能，其他所有功能都需要生根和重新刷新。
使用与列出的处理器相同的处理器的其他供应商的设备很可能也具有这些功能 - 特别是对于 USB，对于串行可能不太如此。
I believe the serial capability on the HTC phones requires a kernel recompile, though the code is there and only needs to be enabled in the kernel config. For the MSM7201 based phones (G1/Magic/Hero) USB host is also a possibility with a kernel recompile after applying an unofficial patch.
Of everything listed, I think USB host on the droid is the only capability available on a device as delivered to consumers, everything else requiring rooting and reflashing.
There's a high probability of other vendor's devices using the same processor as the listed ones to also have these capabilities - especially for USB, maybe less so for serial.