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DescriptionQ454
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Q454FWQualcommASIC interview problem

Order a descriptor before an MMIO doorbell

TechniquesFWValidationDebugOrderdoorbell
DifficultyMedium
TopicFirmware & Validation
LanguageSystemVerilog
Format4 choices
01

Problem

Firmware writes a DMA descriptor in normal memory, then rings a device doorbell through MMIO. The platform does not automatically order those stores. What must firmware do before the doorbell write?

02

Answer choices (4)