Hojuix

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+ welcome :3
+ Hello, i'm Goldenkrew3000, and welcome to my website!
+ Some facts about me: +

+ +

+
+ I am 21 +
+
+
+ I live in Queensland, Australia (unfortunately) +
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+ My native language is English, and I know a little Korean +
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+ My primary programming language is C +
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+ I love cooking/baking, even if I don't do it too often +
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+ +

+ If you want to contact me, you can at: +

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+ On the projects panel, you can find multiple of my projects (Both completed + and in-progress). If the link is red, it means that the page has not yet been + created.
+ EDIT: I have not had much time lately, and the SeaBIOS Fork page is also incomplete. It's in the middle of rewriting so sections are duplicated. Don't bother at this time basically. +

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+ SeaBIOS Fork +

+ +

+ This is basically some notes on my personal fork of SeaBIOS, along with explanations + on certain design choices I made. +

+ +

+ + General information + +

+ +

+ Please keep in mind that this is my personal fork of SeaBIOS, and is not intended + for other people to use.
+ Although, if you so choose to, I am not going to stop you ;)
+ Also, this SeaBIOS fork is both intended to, and has only been tested in use as + a payload for Coreboot (QEMU x86_64, Thinkpad T460s).
+ If you are interested in either using this, or just want to see the commits/code, + it is located + + here (clickable). +
+ +

+ +

+
+ + Change 1 - Security through Obscurity + +
+

+ Now, before you even think it: Yes, I know security through obscurity is + objectively a terrible method if done alone.
+ This change involves two subchanges, which are configurable rebranding + and hiding the boot menu key respectively.
+ +

+
+ + Configurable Rebranding + +
+

+ All SeaBIOS branding can be changed at compile time using the precompiler + to use custom branding strings defined in the configuration as to hide + what the actual bootloader is. Eventually, I want to have this change to + the extent that a theoretical attacker could pull the binary, pull every + string from it, and find nothing that is identifiable as SeaBIOS. +

+
+ + Hiding the boot menu key + +
+

+ When SeaBIOS reaches to the boot menu, a message is displayed to press + a key (By default, ESC) to enter the boot menu. This change allows + changing both the boot key and boot menu message from the configuration + at compile time. This is not extremely helpful in it's current state, as it + does not greatly increase security as a theoretical attacker could just + spam every key on the keyboard until success. Although this could be + changed in the future to potentially require a key combination instead + (or even a password), greatly increasing the difficulty of booting + potentially malicious boot media. +

+
+ + Change 2 - Configurable Pre-Delay and the removal of the native bootsplash + implementation + +
+

+ First, I removed SeaBIOS's native implementation for displaying a bootsplash image, + as I could not get it to function.
+ I also figured that the less code running, the better.
+ Although, I still wanted a bootsplash, which leads me into my second point.
+ I added a configurable pre-delay that delays SeaBIOS's clearing of the framebuffer + by a predetermined amount of milliseconds.
+ This allows a set amount of time for Coreboot's bootsplash implementation to + display a boot image before displaying the boot manager. + + + So, I removed SeaBIOS's native implementation for displaying a bootsplash image, + as I could not get it to function (Probably due to my inability to get the + original configuration method to work, as talked about in Change 4). Although, I + still wanted a bootsplash, and Coreboot's native implementation worked really well. + I also removed SeaBIOS's implementation to remove the possibility that at some point + on some random firmware revision that it would just start working, and I would + end up with two bootsplash sequences. + + + Now, this introduces an issue: SeaBIOS doesn't have any method to play nicely + with Coreboot's bootsplash. So to solve this, I have added a pre-delay option + into SeaBIOS's configuration to allow the user to set a variable delay in + milliseconds just before SeaBIOS clears the framebuffer, allowing time for + Coreboot's bootsplash to display. +

+
+ + Change 3 - TPM support removed + +
+

+ This might seem like a weird change, even more so considering that I live in + a country that doesn't restrict the use of TPMs (Currently, anyway). + Personally, I believe that all highly regarded secrets (Encryption keys, etc) + should be held either solely in your brain, or physically written down in + an encoded form. The TPM functionality in SeaBIOS contains a non-inconsequential + amount of code, that while it probably doesn't contain exploits, I don't use + it so I might as well remove it to lower the risk anyway. +

+
+ + Change 4 - New configuration scheme + +
+

+ This is by far the largest change in this fork.
+ Instead of SeaBIOS being configured through a file-based scheme from CBFS, + it is now configured in a header file before compilation.
+ I did this because personally I found configuring SeaBIOS to be extremely + confusing, and I couldn't even get it to work properly.
+ The new configuration file is in src/rf_config.h.
+ Now, you might ask, why rf_config.h. Well, it's name comes from the previous + functions used to fetch configuration values, which were romfile_*().
+

+ +

+ + +

+ Document version 1 +

+ Last edited 2026/02/21 +

+ +