I currently writing a EDID Script to be able to choose custom resolutions in my Fedora25
I found this assembly script to generate the different solutions. I was able to use this as a "template" and my python script works fine generating the CEA Extension Blobs. Now i want to merge the "Head" and my CEA Blobs with the help of the Wikipedia EDID Byte Order Site.
But in the GitHub Skript this (end1-start1) confuses me:
Descriptor2:
start1: .ascii "Linux #0"
end1: .byte 0x0a /* End marker */
.fill 12-(end1-start1), 1, 0x20 /* Padded spaces */
How can i do "Linux #0" - 10? (0x0a = 10)
When i converte "Linux #0" i get 76 105 110 117 120 32 35 48 what doesnt make sense with the 18 Byte for the Descriptor?
In assembler, the tokens at the beginning of lines refer to addresses. start1 is the address where the string "Linux #0" starts, end1 is the address where the byte 0x0a starts (or is located because it is a single byte). The term (end1-start1) refers to the difference of the addresses. Since the assembler places the things right after each other into the memory, this is the length of the string "Linux #0", i. e. 8.
The term 12 - (end1-start1) then is the number of padding bytes needed to fill up the thing to 12 bytes. These are then placed behind the .byte 0x0a (.filled with spaces (0x20)).