[XL] Change in coreboot[main]: mb/lattepanda: Add support for LattePanda Mu

[KunYi Chen (Code Review)]

Attention is currently required from: Felix Held, Nicholas Chin, Nicholas Sudsgaard, Paul Menzel.

KunYi Chen has posted comments on this change by KunYi Chen. ( https://review.coreboot.org/c/coreboot/+/83719?usp=email )

Change subject: mb/lattepanda: Add support for LattePanda Mu
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Patch Set 24:

(2 comments)

File src/mainboard/lattepanda/mu/bootblock.c:

https://review.coreboot.org/c/coreboot/+/83719/comment/1934e83d_b03995b3?usp... :
PS21, Line 20: /*
             :  * IT8613E Super I/O Chip Initialization Settings
             :  *
             :  * Source: IT8728FPeiInit module
             :  * Purpose: Configure the IT8613E Super I/O chip during system startup
             :  *
             :  * Analysis Process:
             :  * 1. Extract the 'IT8728FPeiInit' module from the original BIOS
             :  *    using UEFITool NE alpha 68 (Nov 4 2023).
             :  * 2. Load the extracted module into Ghidra v11.1.2 for disassembly and analysis
             :  * 3. Identify and document the initialization settings from the disassembled code
             :  *
             :  */
> Disassembling and reverse engineering are illegal in some jurisdictions. Better remove it.

okay, remove the describe in latest patch

https://review.coreboot.org/c/coreboot/+/83719/comment/8c933216_056c34c5?usp... :
PS21, Line 96: static void it8613e_init(const u16 p_idx, const u16 p_dat, const struct initdata *table, const size_t count)
             : {
             : 	u8 val;
             : 
             : 	for (size_t i = 0; i < count; i++) {
             : 		outb(table[i].reg, p_idx);
             : 
             : 		if (table[i].OpAnd == 0) {
             : 			val = table[i].OpOr;
             : 		} else {
             : 			val = ((inb(p_dat) & table[i].OpAnd) |
             : 				table[i].OpOr);
             : 		}
             : 
             : 		outb(val, p_dat);
             : 	}
             : }
> Is it possible to do this in the Super I/O code (`src/superio/ite/it8613e/`)? This could be done lat […]

Due to the lack of a datasheet or programming guide for the IT8613E/LX, we need to explore alternative methods to address the power state transition issue on the board.