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Non-volatile random access memory; RAM that doesn't lose the stored information when the power is turned off, unlike traditional RAM
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PRAM and NVRAM differences and overlap with eachother and UEFI firmware chip
Yes, PRAM is stored on the same NVRAM chip as the firmware variables, but it is managed separately. It actually shows up as a device in the firmware device tree. … The nvram command line program only manipulates the firmware variables stored in NVRAM, and so does not let you access the PRAM partition. …