What the developer wrote
Authored by Marko Bencun
Use 9x9 bootloader screen font
The bootloader selects the 9x9 font before rendering text, and Abort does the
same. Use that font as the bootloader UG_Init default so the 11x10 font table is
not linked into bootloader images.
bb02p-bl-multi-production.bin shrinks from 50572 to 48556 bytes.
What changed, and why it matters
This commit changes the default on-screen font used by the bootloader from an 11x10 pixel font to a 9x9 pixel font. The only stated purpose is to make the bootloader firmware file smaller by avoiding inclusion of the larger font's data table. There is no indication this fixes a security vulnerability.
No security action required. Treat as a normal firmware size optimization.
Security signals we found
No strong security signals were identified.
Evidence from the diff
In src/screen.c, screen_init() now passes &font_font_a_9X9 to UG_Init when BOOTLOADER is defined, instead of always using &font_font_a_11X10. This is a size-optimization change: the 11x10 font table is no longer linked into bootloader images, reducing the bootloader binary by roughly 2 KB. The bootloader and Abort paths already explicitly selected the 9x9 font before rendering, so this only aligns the default initialization with actual runtime behavior.
Changed components
src/screen.cbootloader display initializationInspect captured patch +4 / −0
diff --git a/src/screen.c b/src/screen.c
index 0f77566..75d4659 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -102,7 +102,11 @@ void screen_init(
{
_mirror_fn = mirror_fn;
_clear_fn = clear_fn;
+#ifdef BOOTLOADER
+ UG_Init(&guioled, pixel_fn, &font_font_a_9X9, SCREEN_WIDTH, SCREEN_HEIGHT);
+#else
UG_Init(&guioled, pixel_fn, &font_font_a_11X10, SCREEN_WIDTH, SCREEN_HEIGHT);
+#endif
}
void screen_clear(void)
Why this scored 15/100
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