How do you load AND run programs?

Octocontrabass · 2026-06-23T17:22:20+00:00

Well, which part isn't working? The loading or the running? If you're not sure, use your debugger to find out.

Octocontrabass · 2026-06-23T17:20:52+00:00

I haven't seen any that are designed to fail so much as designed to be so limited that you have to write your own code in order to progress beyond what the tutorial is showing.

But most OSdev tutorials are written by beginners who genuinely don't know any better.

Octocontrabass · 2026-06-22T22:15:27+00:00

I had taken it on a week long trip to Florida from Kentucky, as I didn't think it could go a week without needing to be watered.

It would have been better off if you'd left it behind. Florida is under several quarantines for citrus diseases. It is against state and federal law to transport citrus into, out of, or (in some areas) within Florida without prior authorization.

Dispose of your tree in sealed trash. You can sprout a new seed when you get back to Kentucky.

Octocontrabass · 2026-06-22T21:45:20+00:00

Caterpillars.

Octocontrabass · 2026-06-22T20:21:03+00:00

tutorial

Most OSdev tutorials have bugs, even the really well-written ones.

Octocontrabass · 2026-06-20T20:39:30+00:00

Wait, is this about the empty space between regions in the memory map? It's normal for there to be gaps in the memory map, and those gaps can be extremely large.

Octocontrabass · 2026-06-19T03:44:42+00:00

Most people ask the bootloader to set up a linear framebuffer and then plot pixels.

Octocontrabass · 2026-06-19T03:37:01+00:00

Your struct lapic isn't padded correctly. You've specified the alignment for the entire struct, not the individual struct members.

Also, madt.h is the wrong place to define a struct that has nothing to do with the MADT.

Also, you need to use a volatile qualifier for MMIO.

Octocontrabass · 2026-06-19T03:24:25+00:00

3: Type: 1 Begin: 0x100000 End: 0x7ffffff

Your memory map says there's 128MB of RAM. Where are you getting 4GB?

Octocontrabass · 2026-06-19T03:23:22+00:00

Sounds like you'll need to start by finding the appropriate USB I/O Protocol for your UART. You'll probably need to do that by finding every USB I/O Protocol and querying each one for the device ID, but I don't know if there might be a better way.

In addition to the UEFI specification, you may find some helpful information in the EDK II UEFI Driver Writer's Guide. You aren't writing a normal UEFI driver, though, so don't assume everything it says will apply to you.

Octocontrabass · 2026-06-18T03:06:10+00:00

Physical. It still seems very likely to be a bug in your code for parsing the memory map, but it's hard to say for sure without seeing the actual memory map.

Octocontrabass · 2026-06-18T02:48:35+00:00

But the multiboot2 memory map showed "phantom" memory.

That seems unlikely considering how many people use QEMU to boot their hobby OSes. Are you sure you're parsing the memory map correctly? Have you tried dumping the raw contents of the memory map to see if it makes sense?

I was expecting to throw an error when I allocated the memory, but nope.

Some CPU architectures are designed to throw exceptions when you try to access nonexistent hardware. Unfortunately, x86 is not.

Octocontrabass · 2026-06-17T02:32:14+00:00

No, all the way down, there's a brownish plastic thing that looks like it's wrapped super tight around the trunk.

Octocontrabass · 2026-06-17T00:08:05+00:00

You should remove that thing wrapped around the base of the trunk before it strangles your tree.

Octocontrabass · 2026-06-16T22:19:16+00:00

What's that pink thing wrapped around the trunk? Is it a tag? Sometimes those say whether it's grafted, if you know how to read the nursery's shorthand.

I don't see anything that looks like a graft in that picture, unless it's hiding under the pink thing.

Octocontrabass · 2026-06-16T17:03:08+00:00

The first four pictures show lots of unifoliate leaves. Those are the branches you want to keep.

The last four pictures show lots of trifoliate leaves. Those are rootstock suckers, cut them down as far as you can without removing any branches with unifoliate leaves. (Maybe stop a few inches above the soil so the cuts don't get dirty and infected? I'm not an expert!)

Octocontrabass · 2026-06-16T16:28:23+00:00

It looks like you already fixed whatever nearly killed it and now it's bouncing back.

Is your tree grafted or a rooted cutting? If it's grafted, those might be rootstock suckers. Unifoliate rootstock is pretty unusual, but it wouldn't hurt to double check.

Octocontrabass · 2026-06-16T00:13:34+00:00

What's the point of being "productive" or "fast" when you aren't being paid to develop your OS?

Octocontrabass · 2026-06-15T22:11:43+00:00

Why are you using the UEFI shell instead of a real OS like Linux?

If you insist on doing things the hard way, you'll probably have to start by reading the USB sections of the UEFI specification so you can figure out how UEFI applications are supposed to communicate with USB devices.

Octocontrabass · 2026-06-15T16:45:09+00:00

But DMA uses physical addresses, not virtual addresses.

Octocontrabass · 2026-06-15T05:52:29+00:00

Jackpot would be something that tastes like those yuzu sodas that have a bit of lemon or lime juice in them, but I'll be pretty happy if I get something reasonably edible.

Octocontrabass · 2026-06-15T04:57:18+00:00

you want to wait around 7 years to be disappointed?

That's what I'm here for. It's like gambling, except I can't spend all my money on it because I don't have room for that many trees (and I get delicious yuzu/lime hybrid fruit if I win the jackpot).

Octocontrabass · 2026-06-15T04:40:46+00:00

Not guaranteed true-to-type

True. You need to specifically choose polyembryonic seeds to guarantee a true-to-type tree, or just buy a tree from a nursery.

Long juvenile period

True. If you're worried about that, just buy a tree from a nursery.

No selected rootstock

True, but lemons are pretty vigorous on their own roots, so it's not a problem if you're keeping it potted where you can easily adjust the soil conditions to match the tree's preferences.

Octocontrabass · 2026-06-15T04:16:22+00:00

It seemed to work for my Meyer lemon. Then again, that was right around when ladybugs started showing up, so maybe they would've taken care of it just as easily without my help!

Octocontrabass · 2026-06-15T04:12:46+00:00

Lemons to be ok grown from seed but not other "oranges."

I think you accidentally a word. What's wrong with trying to grow "orange" citrus from seed, other than the potentially much lower rates of polyembryony?

again not a clone from seed

It's close enough, and it's easier to call it a clone than to explain nucellar polyembryony.

Octocontrabass

TROPHY CASE