STRUCT EC_RESPONSE_FLASH_INFO_1(9)

💅 struct ec_r...flash_info_1(9) — Kernel API Manual, but make it make sense

okay so bestie, welcome to the kernel API manual 9 section, and today's main character is struct ec_response_flash_info_1 🎀 that's the response you get back from the flash info v1 command. iconic little reply struct, honestly.

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✨ NAME ✨

struct ec_response_flash_info_1 — the response to the flash info v1 command 💖 that's it, that's the vibe.

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🌸 SYNOPSIS 🌸

struct ec_response_flash_info_1 {
    uint32_t flash_size;
    uint32_t write_block_size;
    uint32_t erase_block_size;
    uint32_t protect_block_size;
    uint32_t write_ideal_size;
    uint32_t flags;
 };

look at her. six uint32_t fields. no notes. 🫶

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👑 Members 👑

• flash_size — usable flash size, in bytes. that's the actual usable capacity bestie, not the marketing number 💀
• write_block_size — write block size. your write offset and size both have to be a multiple of this. no cap, no exceptions ✨
• erase_block_size — erase block size. erase offset and size must be a multiple of this too. match the vibe or it's not happening 🙈
• protect_block_size — protection block size. protection offset and size must be a multiple of this. same energy, protection edition 🔥
• write_ideal_size — ideal write size in bytes ⭐ writes go fastest when the size is exactly this and the offset is a multiple of this. think about it: an EC might have a write buffer that can do half-page operations when the data is aligned, plus a slower word-at-a-time write mode. so like, aligned = slay, unaligned = 🐌 periodt.
• flags — flags! go look at EC_FLASH_INFO_*, that's where the lore lives 💅

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🦋 Description 🦋

so version 1 gives you the same initial fields as version 0, and then additional fields following after. it's giving glow-up, not rewrite 💖

also, tiny little compiler drama for you: gcc anonymous structs don't seem to get along with the __packed directive 😭 and if they did — if they did — we'd define the version 0 structure as a sub-structure of this one. but they don't. so we can't. moving on. 💀

and version 2? version 2 supports flash banks of different sizes 🎀 here's how that goes:

• the caller specified the number of banks it has preallocated (num_banks_desc)
• the EC returns the number of banks describing the flash memory
• it adds banks descriptions up to num_banks_desc

fr fr, that's the whole system.

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🌈 SEE ALSO 🌈

kernel file ./include/linux/platform_data/cros_ec_commands.h — that's home base, go read it 👑

and the whole extended friend group:

• struct ec_lpc_host_args(9)
• struct ec_host_request(9)
• struct ec_host_response(9)
• struct ec_response_proto_version(9)
• struct ec_params_hello(9)
• struct ec_response_hello(9)
• struct ec_response_get_version(9)
• struct ec_params_read_test(9)
• struct ec_response_read_test(9)
• struct ec_response_get_chip_info(9)
• struct ec_response_board_version(9)
• struct ec_params_read_memmap(9)
• struct ec_params_get_cmd_versions(9)
• struct ec_params_get_cmd_versions_v1(9)
• struct ec_response_get_cmd_versions(9)
• struct ec_response_get_comms_status(9)
• struct ec_response_get_protocol_info(9)
• struct ec_response_flash_info(9)
• struct ec_params_flash_read(9)
• struct ec_params_flash_write(9)
• struct ec_params_flash_erase(9)
• struct ec_params_flash_erase_v1(9)
• struct ec_params_flash_protect(9)
• struct ec_response_flash_protect(9)
• struct ec_params_flash_region_info(9)
• struct ec_params_flash_select(9)
• struct ec_params_cec_write(9)
• struct ec_params_cec_write_v1(9)
• struct ec_params_cec_read(9)
• struct ec_response_cec_read(9)
• struct ec_params_cec_set(9)
• struct ec_params_cec_get(9)
• struct ec_response_cec_get(9)
• struct ec_response_cec_port_count(9)
• struct ec_params_battery_static_info(9)
• struct ec_response_battery_static_info(9)
• struct ec_params_battery_dynamic_info(9)
• struct ec_response_battery_dynamic_info(9)
• struct ec_params_charger_control(9)

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bestie the whole flash + cec + battery + charger cinematic universe is right there. iykyk 💜

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okay that's the page!! 🧚 sign-off time: this one lives in ./include/linux/platform_data, dated October 2026, and the man page is struct ec_r...flash_info_1(9) — go forth and align your writes, ily, bye 💅✨🍓