spi_nor_set_4byte_addr_mode(9)

💅 spi_nor_set_4byte_addr_mode(9) — like, the Kernel API Manual, bestie

okay so this is a page straight out of the Kernel API Manual, and it's all about one tiny little function that flips your flash chip between 3-byte and 4-byte addressing. it's giving "small function, big consequences" energy fr fr 🎀

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✨ NAME ✨

spi_nor_set_4byte_addr_mode — Set address mode. that's it. that's the whole vibe. 💫

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🦋 SYNOPSIS 🦋

int spi_nor_set_4byte_addr_mode (struct spi_nor *nor , bool enable );

look at her go. two args, one int coming back at you. no cap, she's neat. ✨

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🌸 ARGUMENTS 🌸

• nor — pointer to a 'struct spi_nor'. yes, the actual flash thing you're messing with. she's the main character here 👑
• enable — enable/disable 4 byte address mode. so like, true = 4-byte era, false = back to 3-byte, pick your fighter 💅

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⭐ RETURN ⭐

0 on success, -errno otherwise. so if you get a 0 you're slaying 💖, and if you get anything else, that's a whole negative number telling you what went wrong. read it. respect it. 🫶

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🔥 SEE ALSO 🔥

buckle up bestie, this list is long — but every single one of these is a real one, i promise 🙈

• spi_nor_get_cmd_ext(9), spi_nor_spimem_setup_op(9), spi_nor_spimem_bounce(9), spi_nor_spimem_exec_op(9)
• spi_nor_spimem_read_data(9), spi_nor_read_data(9), spi_nor_spimem_write_data(9), spi_nor_write_data(9)
• spi_nor_read_any_reg(9), spi_nor_write_any_volatile_reg(9), spi_nor_write_enable(9), spi_nor_write_disable(9)
• spi_nor_read_id(9), spi_nor_read_sr(9), spi_nor_read_cr(9)
• spi_nor_set_4byte_addr_mode_en4b_ex4b(9), spi_nor_set_4byte_addr_mode_wren_en4b_ex4b(9), spi_nor_set_4byte_addr_mode_brwr(9)
• spi_nor_sr_ready(9), spi_nor_use_parallel_locking(9), spi_nor_ready(9)
• spi_nor_wait_till_ready_with_timeout(9), spi_nor_wait_till_ready(9), spi_nor_global_block_unlock(9)
• spi_nor_write_sr(9), spi_nor_write_sr1_and_check(9), spi_nor_write_16bit_sr_and_check(9), spi_nor_write_16bit_cr_and_check(9)
• spi_nor_write_16bit_sr_cr_and_check(9), spi_nor_write_sr_and_check(9), spi_nor_write_sr_cr_and_check(9)
• spi_nor_write_sr2(9), spi_nor_read_sr2(9)
• spi_nor_erase_die(9), spi_nor_div_by_erase_size(9), spi_nor_find_best_erase_type(9)
• spi_nor_init_erase_cmd(9), spi_nor_destroy_erase_cmd_list(9), spi_nor_init_erase_cmd_list(9), spi_nor_erase_multi_sectors(9)
• spi_nor_sr1_bit6_quad_enable(9), spi_nor_sr2_bit1_quad_enable(9), spi_nor_sr2_bit7_quad_enable(9)
• spi_nor_spimem_check_read_pp_op(9), spi_nor_spimem_check_readop(9), spi_nor_spimem_check_pp(9), spi_nor_spimem_adjust_hwcaps(9)
• spi_nor_set_erase_type(9), spi_nor_mask_erase_type(9), spi_nor_init_uniform_erase_map(9), spi_nor_select_uniform_erase(9)
• spi_nor_manufacturer_init_params(9), spi_nor_no_sfdp_init_params(9), spi_nor_init_flags(9), spi_nor_init_fixup_flags(9), spi_nor_late_init_params(9)
• spi_nor_sfdp_init_params_deprecated(9), spi_nor_init_params_deprecated(9), spi_nor_init_default_params(9), spi_nor_init_params(9)
• spi_nor_quad_enable(9), spi_nor_soft_reset(9)

like… that's the whole friend group. iykyk 😭💜

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heads up: the kernel file this lives in is ./drivers/mtd/spi-nor/core.c — that's where you'll find her, in her natural habitat 🧚

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that's the page!! mwah 💋 — this little gem is from ./drivers/mtd/spi-nor, dated October 2026, and it says spi_nor_set_4byte_addr_mode(9) on the way out. bye bestie, go set some address modes ✨💅🦋