spi_nor_chec...dp_signature(9)

💅 spi_nor_chec...dp_signature(9) 💅

okay so bestie, welcome to the Kernel API Manual ✨ this one's a lil function from the kernel, and the truncated name up there is literally just the vibe — the real one is spi_nor_check_sfdp_signature. let's get into it 🫶

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🌸 NAME 🌸

spi_nor_check_sfdp_signature — the lil detective that checks for a valid SFDP signature 🔍✨

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🎀 SYNOPSIS 🎀

int spi_nor_check_sfdp_signature (struct spi_nor *nor );

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🦋 ARGUMENTS 🦋

• nor — pointer to a struct spi_nor. that's it, that's the whole argument list, she's low maintenance 💅

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✨ DESCRIPTION ✨

so what does she do? this function is used to detect two things, and honestly she ate:

• whether the flash actually supports the RDSFDP command 👑
• and whether there's a valid SFDP table present in there 🌈

both checks, one function. main character energy fr fr 💖

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🔥 RETURN 🔥

• 0 on success 🎉
• -errno otherwise 😭 (classic kernel behavior, no cap)

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💜 SEE ALSO 💜

the kernel file lives at ./drivers/mtd/spi-nor/sfdp.c — go say hi 🧚

and here's the whole bestie group chat, every single one of them:

• spi_nor_read_raw(9)
• spi_nor_read_sfdp(9)
• spi_nor_read_sfdp_dma_unsafe(9)
• spi_nor_set_erase_settings_from_bfpt(9)
• spi_nor_map_cmp_erase_type(9)
• spi_nor_sort_erase_mask(9)
• spi_nor_regions_sort_erase_types(9)
• spi_nor_parse_bfpt(9)
• spi_nor_smpt_addr_nbytes(9)
• spi_nor_smpt_read_dummy(9)
• spi_nor_get_map_in_use(9)
• spi_nor_region_check_overlay(9)
• spi_nor_init_non_uniform_erase_map(9)
• spi_nor_parse_smpt(9)
• spi_nor_parse_4bait(9)
• spi_nor_parse_profile1(9)
• spi_nor_parse_sccr(9)
• spi_nor_parse_sccr_mc(9)
• spi_nor_post_sfdp_fixups(9)
• spi_nor_parse_sfdp(9)

like, that's a whole friend group and they all live in ./drivers/mtd/spi-nor 💀💖

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and that's the page bestie!! source path ./drivers/mtd/spi-nor, dated October 2026 — periodt, go read some SFDP tables, ily 🎀✨🫶