Download a bios update and open the bios file with a text editor/reader. If you see Phoenix in the file, you know it's a Phoenix bios. Same for the other options (award / ami etc )
For example, typing vostro 1510 bios download in google sent me here:
Downloaded the bios from that page, ran the executable to extract the archive and the bios updater showed up. Title of the updater says "Phoenix WinPhlash" so I would say it's a phoenix bios.
Going into Windows > Temp > Winplash where it extracted the files, there's a BIOS.ROM file... opening that up, there's "Copyright 1985-2006 Phoenix Technologies Ltd.
All Rights Reserved" in it, so it's a phoenix bios.
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