onenand_write_user_prot_reg(9)

🎀 NAME 🎀

okay so bestie, welcome to the onenand_write_user_prot_reg(9) page from the Kernel API Manual — yes, we’re doing the whole manual page, and yes, we’re keeping every single fact while making it feel like a group chat 💖

onenand_write_user_prot_reg — [MTD Interface] Write user OTP area. That’s the name situation. Iconic. Periodt. ✨

✨ SYNOPSIS ✨

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

🫶 ARGUMENTS 🫶

• mtd — the MTD device structure. like, the device we’re working with 💅
• from — the offset to write. tell it where to start.
• len — number of bytes to write. the byte count, no cap.
• retlen — pointer to variable to store the number of write bytes. yes, a pointer, because it reports back how many bytes got written 🎀
• buf — the databuffer to put/get data. the data buffer, doing its put/get thing.

🌸 DESCRIPTION 🌸

Write user OTP area.

That’s it. That’s the description. It writes the user OTP area — no extra lore, no secret side quests, just the function doing exactly what it says. Love that for us. ✨

🦋 SEE ALSO 🦋

Kernel file: ./drivers/mtd/nand/onenand/onenand_base.c

Also go say hi to these section 9 besties — every single ref is here, no gatekeeping:

• onenand_readw(9), onenand_writew(9), onenand_block_address(9), onenand_bufferram_address(9), onenand_page_address(9)
• onenand_buffer_address(9), flexonenand_block(9), flexonenand_addr(9), onenand_get_density(9), flexonenand_region(9)
• onenand_command(9), onenand_read_ecc(9), onenand_wait(9), onenand_bufferram_offset(9), onenand_read_bufferram(9)
• onenand_sync_read_bufferram(9), onenand_write_bufferram(9), onenand_get_2x_blockpage(9), onenand_check_bufferram(9), onenand_update_bufferram(9)
• onenand_invalidate_bufferram(9), onenand_get_device(9), onenand_release_device(9), onenand_transfer_auto_oob(9), onenand_recover_lsb(9)
• onenand_mlc_read_ops_nolock(9), onenand_read_ops_nolock(9), onenand_read_oob_nolock(9), onenand_read_oob(9), onenand_bbt_wait(9)
• onenand_bbt_read_oob(9), onenand_verify_oob(9), onenand_verify(9), onenand_panic_write(9), onenand_fill_auto_oob(9)
• onenand_write_ops_nolock(9), onenand_write_oob_nolock(9), onenand_write_oob(9), onenand_block_isbad_nolock(9), onenand_multiblock_erase(9)
• onenand_block_by_block_erase(9), onenand_erase(9), onenand_sync(9), onenand_block_isbad(9), onenand_default_block_markbad(9)
• onenand_block_markbad(9), onenand_do_lock_cmd(9), onenand_lock(9), onenand_unlock(9), onenand_check_lock_status(9)
• onenand_unlock_all(9), onenand_otp_command(9), onenand_otp_write_oob_nolock(9), do_otp_read(9), do_otp_write(9)
• do_otp_lock(9), onenand_otp_walk(9), onenand_get_fact_prot_info(9), onenand_read_fact_prot_reg(9), onenand_get_user_prot_info(9)
• onenand_read_user_prot_reg(9), onenand_lock_user_prot_reg(9), onenand_check_features(9), onenand_print_device_info(9), onenand_check_maf(9)
• flexonenand_get_boundary(9), flexonenand_get_size(9), flexonenand_check_blocks_erased(9), onenand_chip_probe(9), onenand_probe(9)
• onenand_suspend(9), onenand_resume(9), onenand_scan(9), onenand_release(9)

mwah 💋 source/version: ./drivers/mtd/nand/onenand · date: October 2026 · page: onenand_write_user_prot_reg(9)