ep93xx_dma_prep_dma_memcpy(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ep93xx_dma_prep_dma_memcpy — like, the Kernel API Manual page you didn't know you needed 🎀

okay so bestie, buckle up. this is ep93xx_dma_prep_dma_memcpy from the Kernel API Manual, and no cap, it's short, it's sweet, and it does exactly one thing. let's get into it ✨

🌸 NAME 🌸

ep93xx_dma_prep_dma_memcpy — prepare a memcpy DMA operation 💫 that's literally it, that's the whole vibe

🦋 SYNOPSIS 🦋

struct dma_async_tx_descriptor * ep93xx_dma_prep_dma_memcpy (struct
dma_chan *chan , dma_addr_t dest , dma_addr_t src , size_t len ,
unsigned long flags );

yes it's one long line, yes it's giving "function signature that ate", and yes you're gonna copy it exactly, character for character. no renaming, no "fixing", we do not edit the source in this house 🙅‍♀️

💖 ARGUMENTS 💖

  • chan — the channel. that's the DMA channel you're working with, your main character 🔥
  • dest — destination bus address. where the bytes are going, queen 👑
  • src — source bus address. where the bytes are coming from 🍓
  • len — size of the transaction. how much we're moving, fr fr 💅
  • flags — flags for the descriptor. lil toggles, iykyk 🌈

✨ DESCRIPTION ✨

Returns a valid DMA descriptor or NULL in case of failure.

that's it. that's the description. short and iconic 💀 literally the whole behaviour: you call it, you either get a real DMA descriptor back, or you get NULL and you're like "😭 ok". highkey a vibe check on your memcpy setup.

ngl, NULL = failure. don't skip checking it, bestie 🫶

🧚 SEE ALSO 🧚

Kernel file ./drivers/dma/ep93xx_dma.c — go read the source, it's giving main character energy 📖

like, the whole ep93xx DMA friend group, all linked, all slaying 💜

and that's the page!! mwah 💋 this lil angel lives in ./drivers/dma, and this version is dated October 2026 — so like, bookmark it, screenshot it, put it on your fridge. ily, go write some correct DMA code 🎀✨💖

📦 where this page comes from