STRUCT AT91_PM_BU(9)

Okay bestie, this is the Kernel API Manual 💖 and today's main character is struct at91_pm_bu(9) — the AT91 power management backup unit data structure. Buckle up, it's a tiny struct but it's got lore. 🎀

🎀 NAME 🎀

struct at91_pm_bu - AT91 power management backup unit data structure. That's the whole vibe: it's the data structure for the AT91 power management backup unit, no cap. ✨

✨ SYNOPSIS ✨

Here's the struct exactly as it shows up, bestie — copy it, love it, respect the semicolons:

       struct at91_pm_bu {
           int suspended;
           unsigned long reserved;
           phys_addr_t canary;
           phys_addr_t resume;
           unsigned long ddr_phy_calibration[BACKUP_DDR_PHY_CALIBRATION];
        };

🌸 Members 🌸

• suspended — true if suspended to backup mode. Literally true when it's suspended to backup mode. 🔥
• reserved — reserved. No notes, just reserved energy. 🎀
• canary — canary data for memory checking after exit from backup mode. It's giving memory-checking canary realness. 💅
• resume — resume API. That's it, that's the field. 😌
• ddr_phy_calibration — DDR PHY calibration data: ZQ0CR0, first 8 words of the memory. Obsessed with the specificity. 🍓

🦋 SEE ALSO 🦋

Go look at these too, iykyk:

• Kernel file ./arch/arm/mach-at91/pm.c
• struct at91_pm_sfrbu_regs(9)
• enum at91_pm_eth_clk(9)
• enum at91_pm_eth(9)
• struct at91_pm_quirk_eth(9)
• struct at91_pm_quirks(9)
• struct at91_soc_pm(9)
• enum at91_pm_iomaps(9)
• at91_pm_switch_ba_to_auto(9)

mwah 💋 — source/version: ./arch/arm/mach-at91; date: October 2026; and the page is struct at91_pm_bu(9). Bye bestie! 🫶