omap_enable_hwecc_bch(9)

💅 omap_enable_hwecc_bch(9) — from the Kernel API Manual, bestie

okay so picture this: we're in the kernel, we're in the NAND zone, and this function is the one that tells the GPMC to go do its BCH ECC math. it's giving ✨ hardware offload ✨ and honestly? iconic. let's get into it 🫶

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🌸 SYNOPSIS 🌸

void omap_enable_hwecc_bch (struct nand_chip *chip , int mode );

returns nothing (void), takes two things, and then it's off to the races. periodt 💅

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🎀 ARGUMENTS 🎀

• chip — the NAND chip object itself, our main character 🌟
• mode — the Read/Write mode, i.e. are we reading or writing rn, bestie? that's the whole vibe check 📖✍️

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🦋 DESCRIPTION 🦋

so here's the lore. when you're rolling with BCH plus SW correction (and that means no ELM — like, none, not a single ELM in sight 🙈), the sector size gets set to 512 bytes, and we use wrapping mode BCH_WRAPMODE_6 for both reading and writing. both!! equal treatment!! we love to see it 💖

and the sizing goes like this:

• eccsize0 = 0 — no additional protected byte in the spare area, zero, nada, none 🌸
• eccsize1 = 32 — this one skips 32 nibbles, which is literally 16 bytes per sector in the spare area, math is mathing 🔥

so yeah, the function programs the GPMC to actually perform the BCH ECC calculation, and those numbers are the whole recipe. iykyk 🧚

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⭐ SEE ALSO ⭐

all the siblings and cousins in this little kernel family, plus where they live:

• kernel file ./drivers/mtd/nand/raw/omap2.c
• omap_prefetch_enable(9)
• omap_nand_data_in_pref(9)
• omap_nand_data_out_pref(9)
• omap_nand_data_in_dma_pref(9)
• omap_nand_data_out_dma_pref(9)
• gen_true_ecc(9)
• omap_compare_ecc(9)
• omap_correct_data(9)
• omap_calculate_ecc(9)
• omap_enable_hwecc(9)
• _omap_calculate_ecc_bch(9)
• omap_calculate_ecc_bch_sw(9)
• omap_calculate_ecc_bch_multi(9)
• erased_sector_bitflips(9)
• omap_elm_correct_data(9)
• omap_write_page_bch(9)
• omap_write_subpage_bch(9)
• omap_read_page_bch(9)
• is_elm_present(9)

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and that's the whole page, bestie 🎀 it lives over in ./drivers/mtd/nand/raw, stamped October 2026, and honestly it ate. go forth and enable that hardware ECC 👑💜