Jiaxun Yang

Do you have access to serial (i.e. COM/RS232) port on this machine? SeaBIOS will print out relevant log via serial (COM1) and it would be helpful to troubleshooting with those...

Thanks, that's wired tho. I'll make a debug build for you to print more information.

@Gelip here is the debug build. [csmwrap.efi.zip](https://github.com/user-attachments/files/20273495/csmwrap.efi.zip)

> Thx. I noticed same thing on other PC - Asus B85 (CPU Intel Gen4 Haswell) Besides, if there is a COM port on the motherboard and it is enabled...

Maybe somewhat related to this: https://mail.coreboot.org/hyperkitty/list/[email protected]/thread/RDNRKWBN4N5XQX2TQMM5P4WZ2OOPPNAM/

Hi @Gelip, Sorry for hijacking this topic, it seems like there are some misunderstanding in MSFN thread stating that CSMWrap doesn't support INT13h emulation. I guess this conclusion was drawn...

Can you try this build? https://github.com/FlyGoat/csmwrap/actions/runs/15173994519

> But on Asus B85 other problem and don't detect any boot devices - stuck on SeaBIOS (version efafa75-CSMWrap-34ee5ec) Thanks for reporting back! Is this a regression? Was ASUS B85...

> > Is this a regression? Was ASUS B85 working before? > No, from version 1.0.0 CSMWrap does not work on ASUS B85 (Haswell) Do you mind to try COM...

> CSMWrap Version 1.1.0-12-g90453305b043-dirty debug - https://www.mediafire.com/file/5tqaoapitwm661f/B85.log/file The ahci and 1.2.0 versions show the same thing in Putty: AHCI_34ee5ec - https://pastebin.com/UYxxvnEd 1.2.0 - https://pastebin.com/CqBHnfXc Sorry.. Forgot to attach latest debug...