powernv_flash_write(9)

💅 powernv_flash_write(9) — the Kernel API Manual, but make it make sense

okay so bestie, this is a page from the Kernel API Manual for powernv_flash_write(9) — a kernel function that writes bytes to an MTD device (that's flash memory, iykyk). she's short, she's sweet, she's kind of a mystery. let's get into it 🎀

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✨ NAME ✨

powernv_flash_write — and honestly? the description line is literally empty in the original. the manpage authors left it blank. no cap, there's nothing there. so we move on, main character energy only 💅

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🌸 SYNOPSIS 🌸

int powernv_flash_write (struct mtd_info *mtd , loff_t to , size_t len ,
       size_t *retlen , const u_char *buf );

it's giving "returns an int, takes a whole little friend group of arguments." obsessed. 🫶

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🦋 ARGUMENTS 🦋

here's the whole cast, one by one, no skips:

• mtd — the device itself. the flash chip we're talking to. she's the main character here 👑
• to — the offset to write to. like, where in the device we're dropping the bytes. 📍
• len — the number of bytes to write. the amount. the quantity. 📏
• retlen — the number of bytes actually written. yes bestie, actually — because what you asked for and what you got can be two different things 🙈
• buf — the buffer to get bytes from. this is your source. the vibe provider. 🧺

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💖 DESCRIPTION 💖

so here's the whole plot: it returns 0 if the write was successful, and -ERRNO if an error occurred. that's it. that's the description. short king.

ngl it's giving "the function speaks for itself" — no extra lore, no warnings, just vibes and a return value. if you get 0, you ate. if you get -ERRNO, something went off in the flash and you should look at that. 💀

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🔥 SEE ALSO 🔥

go read the neighbors, they're iconic:

• the kernel file ./drivers/mtd/devices/powernv_flash.c — the source herself, go say hi
• powernv_flash_read(9)
• powernv_flash_erase(9)
• powernv_flash_set_driver_info(9)
• powernv_flash_probe(9)

fr fr read the whole set, they're a package deal 🌈

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lowkey reminder: this page is a lil sparse on purpose — don't go inventing behaviour that isn't written here. 0 means success, -ERRNO means error, and everything else is in the source file, iykyk ⭐

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okay that's the page!! mwah 💋 this manual page lives in ./drivers/mtd/devices, and it was dated October 2026, and it's still titled powernv_flash_write(9) — slay, periodt, go write some flash 🍓✨