omap_calculate_ecc(9)

💫 omap_calculate_ecc 💫

okay so this is a page from the Kernel API Manual, bestie — like, the grown-up kernel docs, section 9. and the function we're obsessing over today is omap_calculate_ecc. it's giving "tiny function, big responsibilities" fr fr 🌸

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✨ NAME ✨

omap_calculate_ecc — generate non-inverted ECC bytes. periodt. 🎀

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🦋 SYNOPSIS 🦋

int omap_calculate_ecc (struct nand_chip *chip , const u_char *dat ,
       u_char *ecc_code );

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💜 ARGUMENTS 💜

• chip — the NAND chip object. your main character, basically 👑
• dat — the pointer to the data on which the ecc is computed. yes, that data 💅
• ecc_code — the ecc_code buffer. it's literally right there in the name, iykyk 🫶

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🔥 DESCRIPTION 🔥

so here's the tea ☕ — using noninverted ECC can be considered ugly, ngl. why? because writing a blank page (ie. padding) will clear the ECC bytes 😭

and like… that's no problem, as long as nobody is trying to write data on the seemingly unused page. as soon as someone does? whole different story bestie 💀

and reading an erased page will produce an ECC mismatch between the generated and read ECC bytes — and that has to be dealt with separately. like, not this function's problem, okay? do not come for her 🌈

lowkey important, highkey iconic: blank page writes clear the ECC bytes, and erased-page reads give you a mismatch you gotta handle on your own 🧚

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⭐ SEE ALSO ⭐

the kernel file is ./drivers/mtd/nand/raw/omap2.c bestie, and here's the whole friend group 🫶 — every single one, no cap:

• 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_enable_hwecc(9)
• omap_enable_hwecc_bch(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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so yeah, that's the whole page 💖 it lives over in ./drivers/mtd/nand/raw, dated October 2026, and she's from the Kernel API Manual, section 9 — slay, documented, iconic 💅✨ 🎀