ENUM DEV_TYPE(9)

💅 enum dev_type(9) — a Kernel API Manual moment ✨

okay bestie, so this page is literally titled enum dev_type(9) and it lives in the Kernel API Manual, and it's about one thing and one thing only: the type of memory DRAM chips used at the stick 🎀. that's the whole vibe. let's get into it.

---

🌸 NAME 🌸

enum dev_type — describes the type of memory DRAM chips used at the stick 💖

---

✨ SYNOPSIS ✨

enum dev_type {
    DEV_UNKNOWN ,
    DEV_X1 ,
    DEV_X2 ,
    DEV_X4 ,
    DEV_X8 ,
    DEV_X16 ,
    DEV_X32 ,
    DEV_X64

};

---

🦋 Constants 🦋

okay so every single member of the enum, no skips, periodt:

• DEV_UNKNOWN — can't be determined, or the MC doesn't support detecting it 😭 (it's giving "we tried", and honestly that's valid)
• DEV_X1 — 1 bit for data ⭐
• DEV_X2 — 2 bits for data ⭐
• DEV_X4 — 4 bits for data 🔥
• DEV_X8 — 8 bits for data 🔥
• DEV_X16 — 16 bits for data 👑
• DEV_X32 — 32 bits for data 👑
• DEV_X64 — 64 bits for data 💀

---

🎀 Description 🎀

typical values are x4 and x8. that's it, that's the whole description, and honestly? iconic. the rest of the enum is just there doing background character work 🧚

ngl bestie, this one's short — but every member counts, so don't go assuming DEV_X32 or DEV_X64 show up in real life just because they're in the enum 🙈

---

👑 SEE ALSO 👑

kernel file ./include/linux/edac.h — and the whole extended friend group 💜:

• enum hw_event_mc_err_type(9)
• enum mem_type(9)
• enum edac_type(9)
• enum scrub_type(9)
• enum edac_mc_layer_type(9)
• struct edac_mc_layer(9)
• struct rank_info(9)
• struct edac_raw_error_desc(9)
• edac_get_dimm(9)
• struct edac_scrub_ops(9)
• struct edac_ecs_ops(9)
• struct edac_mem_repair_ops(9)

go read them, slay 💅

---

and that's a wrap, bestie — this page came to you from ./include/linux, dated October 2026, straight out of the Kernel API Manual. mwah 💖✨🎀