omap_correct_data(9)

✨ omap_correct_data — the kernel API manual, but make it make sense ✨

okay so bestie, we're in the kernel API manual (that's the <9> in omap_correct_data(9) — section 9, kernel routines, iykyk 🧚). this one is all about checking ECC and being like "girl, is this data okay or not" 💅

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🌸 NAME 🌸

omap_correct_data — literally compares the ECC that got read with the ECC the hardware generated. that's it, that's the vibe check 🦋

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⭐ SYNOPSIS ⭐

int omap_correct_data (struct nand_chip *chip , u_char *dat , u_char
*read_ecc , u_char *calc_ecc );

yes the spacing is a little chaotic, no we are not fixing it, it's part of the aesthetic now 🎀

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💖 ARGUMENTS 💖

• chip — your NAND chip object 🫶 the main character of this whole situation
• dat — the page data ✨ like, the actual bytes we're fussing over
• read_ecc — the ecc read from nand flash 🌸 straight off the flash, no filter
• calc_ecc — the ecc read from HW ECC registers 👑 the hardware's own opinion

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💅 DESCRIPTION 💅

so here's the tea ☕ this function compares the ecc read from the nand spare area with the ECC registers values — and if the ECC's mismatched, it will call 'omap_compare_ecc' for error detection and correction. not me handing off to another function, that's teamwork fr fr 🤝

and then the returns, which are giving very clear boundaries bestie:

• if there are no errors, 0 is returned 💚 iconic, flawless, no notes
• if there were errors and all of the errors were corrected, the number of corrected errors is returned 🔥 like a little victory count, we ate
• if uncorrectable errors exist, -1 is returned 💀 and that's the "welp" outcome, no cap

real talk: -1 means uncorrectable errors exist. don't ignore a -1, it is not a vibe, it is a problem 🚩

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🦋 SEE ALSO 🦋

kernel file ./drivers/mtd/nand/raw/omap2.c — the whole friend group lives here, go say hi 🌈

• 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_calculate_ecc(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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okay and finally the sign-off 🎀 this one's filed under ./drivers/mtd/nand/raw, dated October 2026 — so like, slightly future-core of it, we love a timestamp with main character energy 👑 stay slay, read your ECC, mwah 💋✨