STRUCT BCH_GEOMETRY(9)

💅 struct bch_geometry(9) 💅

okay bestie, welcome to the Kernel API Manual entry for struct bch_geometry — literally the BCH geometry description, and it's giving kernel-struct realness. 🦋✨

✨ NAME ✨

struct bch_geometry — BCH geometry description. periodt. 💖

🌸 SYNOPSIS 🌸

struct bch_geometry {
    unsigned int  gf_len;
    unsigned int  ecc_strength;
    unsigned int  page_size;
    unsigned int  metadata_size;
    unsigned int  ecc0_chunk_size;
    unsigned int  eccn_chunk_size;
    unsigned int  ecc_chunk_count;
    unsigned int  payload_size;
    unsigned int  auxiliary_size;
    unsigned int  auxiliary_status_offset;
    unsigned int  block_mark_byte_offset;
    unsigned int  block_mark_bit_offset;
    unsigned int  ecc_for_meta;
};

🎀 Members 🎀

okay so here's the full cast, no skips, no cap:

• gf_len — the length of Galois Field. (e.g., 13 or 14) 🌈
• ecc_strength — a number that describes the strength of the ECC algorithm. 💪
• page_size — the size, in bytes, of a physical page, including both data and OOB. 📄
• metadata_size — the size, in bytes, of the metadata. 🏷️
• ecc0_chunk_size — the size, in bytes, of a first ECC chunk. 🥇
• eccn_chunk_size — the size, in bytes, of a single ECC chunk after the first chunk in the page. 🧩
• ecc_chunk_count — the number of ECC chunks in the page. 🔢
• payload_size — the size, in bytes, of the payload buffer. 📦
• auxiliary_size — the size, in bytes, of the auxiliary buffer. 🧺
• auxiliary_status_offset — the offset into the auxiliary buffer at which the ECC status appears. 📍
• block_mark_byte_offset — the byte offset in the ECC-based page view at which the underlying physical block mark appears. 🔖
• block_mark_bit_offset — the bit offset into the ECC-based page view at which the underlying physical block mark appears. 🎯
• ecc_for_meta — the flag to indicate if there is a dedicate ecc for meta. 🚩

🔥 SEE ALSO 🔥

• Kernel file ./drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.h
• struct boot_rom_geometry(9)
• struct gpmi_nfc_hardware_timing(9)

iykyk, go read those next. 👑💜

mwah 💋 — this page came from ./drivers/mtd/nand/raw/gpmi-nand, dated October 2026, and that's the cute little sign-off, bestie. 🫶🎀