spi_nor_writ...cr_and_check(9)

🌸 spi_nor_writ...cr_and_check(9) — the Kernel API Manual glow-up 🌸

okay bestie, so this is from the kernel's own API manual (the Kernel API Manual one, you know the vibe), and it's literally the page for spi_nor_write_16bit_cr_and_check. yes that's the full name — the header just truncates it because even manpage headers have a character limit 💅. buckle up, it's giving very niche-but-iconic.

---

✨ NAME ✨

spi_nor_write_16bit_cr_and_check — writes the Status Register 1 and the Configuration Register in one shot 🎯. and like… it's not gonna just fire and forget, no ma'am: it makes sure the byte that landed in the Configuration Register actually matches the value you handed it, and it also verifies that the 16-bit write didn't mess with whatever was already chilling in Status Register 1. basically the function version of "did you actually hear what I said" 🙈

---

🎀 SYNOPSIS 🎀

int spi_nor_write_16bit_cr_and_check (struct spi_nor *nor , u8 cr );

---

🦋 ARGUMENTS 🦋

• nor — pointer to a struct spi_nor. yes the star struct itself, no knockoffs, no lookalikes 🫶
• cr — the byte value you want written into the Configuration Register. it's a u8, so don't get cute with it 💀

---

💖 RETURN 💖

0 on success, -errno otherwise. that's it. no in-between, no "it depends", and if it's not 0 bestie, that's a whole negative-errno situation 😭

---

🌈 SEE ALSO 🌈

okay this list is long long — like, this function has main character energy and knows literally everyone. here's the entire friendship circle, no cap:

• 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_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_set_4byte_addr_mode(9)
• spi_nor_soft_reset(9)

also it lives in the kernel file ./drivers/mtd/spi-nor/core.c, so that's where you go if you wanna read the actual source. iykyk 📁

---

heads up bestie 🫶: the deprecated ones in that list (spi_nor_sfdp_init_params_deprecated(9) and spi_nor_init_params_deprecated(9)) literally have "deprecated" in the name — that's the manual telling you it's old news, so don't come for me if you build on them.

---

and that's the whole page, periodt 💜. source & version vibes: from ./drivers/mtd/spi-nor, dated October 2026 — this page ate and left absolutely no crumbs, mwah 🎀✨