spi_nor_set_...gs_from_bfpt(9)

📦 version 7.3.1, in nixpkgs unstable

💅 spi_nor_set_erase_settings_from_bfpt(9)

okay so this is a page from the Kernel API Manual, and honestly? it's a little function that does one very specific little thing and does it beautifully. let's get into it 🎀

✨ NAME ✨

spi_nor_set_erase_settings_from_bfpt — bestie, it sets the erase type settings straight from the BFPT. that's the whole job. no cap. 💖

🌸 SYNOPSIS 🌸

void spi_nor_set_erase_settings_from_bfpt (struct spi_nor_erase_type
*erase , u32 size , u8 opcode , u8 i );

like, it returns nothing (void), it takes four things, and it's literally just here to hand you the vibe of an erase type. iconic behavior honestly ✨

🦋 ARGUMENTS 🦋

  • erase — a pointer to a structure that describes a SPI NOR erase type. it's giving "here's the blank canvas, go fill it in" 🎨
  • size — the size of the sector/block that this erase type erases. big block energy or tiny block energy, you decide 💫
  • opcode — the SPI command op code used to erase that sector/block. the literal instruction, the main character of the operation 👑
  • i — the erase type index as sorted in the Basic Flash Parameter Table. remember this one, it comes back later (see below, iykyk) 🔥

💜 DESCRIPTION 💜

so here's the tea, bestie 🍵 — the supported Erase Types get sorted at init in ascending order, and the smallest Erase Type size ends up as the first member in the erase_type array of the spi_nor_erase_map structure. so like, smallest first, always, that's the rule 💅

what this function does is save the Erase Type index as sorted in the Basic Flash Parameter Table, and the reason it bothers is genuinely important: that index gets used later on to synchronize with the supported Erase Types defined in SFDP optional tables. so don't lose it, okay? it's load-bearing 🫶

🌈 SEE ALSO 🌈

kernel file ./drivers/mtd/spi-nor/sfdp.c — go read it, it's right there 💖

and the whole friend group:

okay that's the whole page, go forth and sort your erase types ascendingly, mwah 💋

sign-off time 🎀 this little masterpiece lives in ./drivers/mtd/spi-nor, it's dated October 2026, and it's from the Kernel API Manual (version: the kernel's own, bestie, it's a kernel doc). slay, bye 👋✨

📦 where this page comes from