vt6420_prereset(9)

💅 vt6420_prereset(9) — a Kernel API Manual moment 🎀

okay bestie, so this one's from the Kernel API Manual, page vt6420_prereset(9), and it's literally the "please don't touch the hardware, I'm begging you" function. sit down, hydrate, let's go ✨

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🌸 NAME 🌸

vt6420_prereset — the prereset hook for vt6420, no cap 🫶

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✨ SYNOPSIS ✨

int vt6420_prereset (struct ata_link *link , unsigned long deadline );

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🦋 ARGUMENTS 🦋

• link — the target ATA link, i.e. the lil connection we're doing the prereset on 💫
• deadline — the deadline, in jiffies, for the whole operation ⏰ (yes, jiffies, that's the unit, we don't make the rules)

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👑 DESCRIPTION 👑

ok so here's the tea ☕: the SCR registers on vt6420 are, and I'm quoting the vibe here, absolute garbage — and they may hang the whole machine completely if you access them with the wrong timing. like, entire box, gone, dead, 💀. not a drill.

so to dodge that catastrophe, vt6420 doesn't hand out generic SCR access operations at all. nope. instead it uses SStatus and SControl only during boot probing, in a controlled way. that's the whole strategy and honestly? iconic 🌈

and because the old (pre EH update) probing code is proven to work, we strictly follow that access pattern. don't get creative, bestie, don't freestyle it, just follow the pattern 🙏

LOCKING: Kernel thread context — and yes it may sleep 😴 (so don't go calling it from somewhere spicy)

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🔥 RETURN 🔥

0 on success, or -errno otherwise. that's it, that's the whole return contract 💖

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/ata/sata_via.c
• svia_tf_load(9)

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mwah 💜 that's the whole page! this lil beauty lives in ./drivers/ata, dated October 2026, and it's brought to you by the source/version line right down there at the bottom of the original. slay, go read the kernel source, ily, bye 🧚‍♀️🎀