spear_mtd_write(9)

💅 spear_mtd_write(9) — like, the Kernel API Manual, bestie ✨

okay so this is spear_mtd_write, a page straight out of the Kernel API Manual and honestly? she's giving "small function, big responsibilities." let's get into it 🫶

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🌸 NAME 🌸

spear_mtd_write — does the write operation exactly as requested by the user. no notes, no cap, she just writes 💖

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✨ SYNOPSIS ✨

int spear_mtd_write (struct mtd_info *mtd , loff_t to , size_t len ,
       size_t *retlen , const u8 *buf );

literally the whole signature, character for character, don't @ me 🎀

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🦋 ARGUMENTS 🦋

• mtd — the MTD information of the memory bank. like, the vibe check of the whole memory bank, iykyk 💫
• to — the address to write to. the destination. the moment. the place 🎯
• len — number of bytes to be written. how much we're writing, fr fr 🌈
• retlen — number of bytes actually wrote. yes, "wrote." and yes, it's a pointer, because she's gonna report back to you 👑
• buf — the buffer from which the data to be taken. the source of the lore 🍓

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💜 DESCRIPTION 💜

so basically: write an address range to the flash chip. iconic behavior 🔥

the rule: data must be written in flash_page_size chunks. that's the law, bestie, no skipping 💅

the good news: the address range may be any size — provided it is within the physical boundaries. key word: provided. don't go past the boundaries, or that's on you 😭

the return: returns 0 on success, non zero otherwise. that's it. that's the whole report card ⭐

⚠️ quick reminder: "non zero otherwise" means something went wrong — treat anything that isn't 0 as a problem, not a personality quirk 🙈

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🧚 SEE ALSO 🧚

• Kernel file ./drivers/mtd/devices/spear_smi.c
• struct spear_smi(9)
• struct spear_snor_flash(9)
• spear_smi_read_sr(9)
• spear_smi_wait_till_ready(9)
• spear_smi_int_handler(9)
• spear_smi_hw_init(9)
• get_flash_index(9)
• spear_smi_write_enable(9)
• spear_smi_erase_sector(9)
• spear_mtd_erase(9)
• spear_mtd_read(9)
• spear_smi_probe_flash(9)
• spear_smi_probe(9)
• spear_smi_remove(9)

like a whole friend group of functions, and you should absolutely go meet all of them 🦋💖

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and that's the page!! 🌈 this little legend lives over in ./drivers/mtd/devices, dated October 2026 — mwah, slay, periodt, go write some flash 💅✨🎀