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DescriptionQ963
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Q963FWGoogleASIC interview problem

Read a changing MMIO register

TechniquesFWMMIOCvolatile
DifficultyEasy
TopicFirmware
LanguageC
Format4 choices
01

Problem

Firmware polls a device status register whose value may change independently of the CPU. The register is mapped at a fixed physical address. Why should the C access use a volatile-qualified MMIO pointer?

02

Answer choices (4)