STRUCT CHAMELEON_BDD(9)

✨ NAME ✨

struct chameleon_bdd — the Chameleon Bridge Device Descriptor, bestie. It's a struct, it describes a bridge device, and yes the name is a whole mouthful. We stan anyway 💅

This is a page from the Kernel API Manual, so like… kernel core, group chat, but make it C.

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🎀 SYNOPSIS 🎀

struct chameleon_bdd {
    unsigned int irq:6;
    unsigned int rev:6;
    unsigned int var:6;
    unsigned int dev:10;
    unsigned int dtype:4;
    unsigned int bar:3;
    unsigned int inst:6;
    unsigned int dbar:3;
    unsigned int group:6;
    unsigned int reserved:14;
    u32 chamoff;
    u32 offset;
    u32 size;
 };

Copy it exactly like that, bit-fields and all — the widths are literally the whole personality of this struct, do not touch them 🔥

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🦋 Members 🦋

Okay so the members, one by one, in order, no skips (iykyk):

• irq — where this thing sits in the FPGA's IRQ controller vector 📍
• rev — the revision of this variant's implementation, like the vibe-check of which version got built
• var — the variant of the IP core 🧚
• dev — the device that the IP core is (identity! main character energy)
• dtype — the device descriptor type 🎀
• bar — the BAR offset that you gotta add to the module offset
• inst — the instance number of the device, and 0 is the first instance ⭐
• dbar — destination bar from the bus _behind_ the bridge (yes, behind, like a secret passage 🙈)
• chamoff — offset within the BAR of the source bus
• offset — (no description on this one, it's giving mysterious 💀)
• size — (also no description, matching mysterious energy 😭)

Ngl, offset and size are listed with nothing next to them in the original. I'm not gonna invent lore for them, that's not the move. 🫶

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🌈 SEE ALSO 🌈

Kernel file ./drivers/mcb/mcb-internal.h struct

chameleon_fpga_header(9), struct chameleon_gdd(9)

Go read those too, bestie, they're the rest of the lore 👑

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💖 That's the whole page! This one's comin' at you from ./drivers/mcb in the Kernel API Manual, dated October 2026 — go forth and describe your bridge devices, you absolute icon 🦋✨