Friends, I got a discrete GPU working! :) After applying the patches of csb_patcher.sh from CB:33509 , I did a change similar to CB:31450 but for A88XM-E sources (see below), got AMD HD6670 dGPU's AtomBIOS (used TechPowerUp GPU-Z utility instead of a lengthy method [1], perhaps a "Retrieval via Linux kernel" would've also worked), and set up a .config as in [2]. Later it turned out AtomBIOS isn't needed, probably because this card has it in its' own flash memory.

Maybe I would try to commit CB:31448 and CB:31450 again, considering they benefit not just G505S but the other boards as well. Since I couldn't get AMD discrete GPU working without the changes like these, they seem to be vitally important.

[1] https://mail.coreboot.org/pipermail/coreboot/2017-July/084660.html
[2] https://pastebin.com/ZJ7cyT8T

diff --git a/src/mainboard/asus/a88xm-e/Kconfig b/src/mainboard/asus/a88xm-e/Kconfig
index ea3073ac00..ca7085304f 100644
--- a/src/mainboard/asus/a88xm-e/Kconfig
+++ b/src/mainboard/asus/a88xm-e/Kconfig
@@ -29,6 +29,7 @@ config BOARD_SPECIFIC_OPTIONS
        select SUPERIO_ITE_IT8728F
        select BOARD_ROMSIZE_KB_8192
        select GFXUMA
+       select MAINBOARD_HAS_MULTIPLE_VGA_ADAPTERS
 
 choice
        prompt "DDR3 memory voltage"
diff --git a/src/mainboard/asus/a88xm-e/OemCustomize.c b/src/mainboard/asus/a88xm-e/OemCustomize.c
index de41f54cd8..b64386381a 100644
--- a/src/mainboard/asus/a88xm-e/OemCustomize.c
+++ b/src/mainboard/asus/a88xm-e/OemCustomize.c
@@ -166,6 +166,8 @@ static CONST PSO_ENTRY ROMDATA MemoryTable_XM_E[] = {
 
 void board_BeforeInitPost(struct sysinfo *cb, AMD_POST_PARAMS *InitPost)
 {
+       /* Set to 0xD0 instead of 0xE0 to avoid the PCI resource allocation problems. */
+       InitPost->MemConfig.BottomIo = 0xD0;
        if (CONFIG(BOARD_ASUS_A88XM_E))
                InitPost->MemConfig.PlatformMemoryConfiguration = (PSO_ENTRY *) MemoryTable_XM_E;
 } 

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