Re: [SeaBIOS] 5 basic features provided by CSM, which SeaBIOS does provide?
On Fri, Dec 18, 2015 at 08:43:37AM +0000, Stojsavljevic, Zoran wrote:
Hello both lists, Jiming,
There are 5 basic features, provided by CSM SeaBIOS payload, and I am looking to list of these features.
Could you, please, provide to me list of these features, and some description, and/or pointer to these descriptions?
I don't fully understand your question. One can build SeaBIOS as a Compatibility Support Module (CSM) for UEFI, and this has been tested with OVMF on virtual machines. It's theoretically also possible to use it as a CSM on real hardware with a UEFI payload on coreboot, but to the best of my knowledge that has never been tested. When SeaBIOS is used as a CSM module, it provides legacy 16bit BIOS support on UEFI machines to bootloaders and option roms that require that support. The only link I have for SeaBIOS CSM is: http://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support_... Cheers, -Kevin
Hello Kevin, All Good with setting CSM ON for legacy support. You need it for 16 bit BIOSes, and for legacy OSes, such as WIN XP or WIN 7 and derivatives. Here is the question I am wondering: What if I decide to bring FSP -> Coreboot -> SeaBIOS -> WIN 8.1 32. Do I really need SeaBIOS with option set to: CSM ON (I brought WIN 8.1 32 on CC2 with SeaBIOS and feature CSM ON)? In other words, can I bring WIN 8.1 32 on FSP -> Coreboot -> SeaBIOS with CSM OFF? The same question for: FSP -> Coreboot -> SeaBIOS -> WIN 8.1 64? I guess, here is CSM ON mandatory. Am I correct? Could I have a true 32 or 64 UEFI compliant OS on BSP: FSP -> Coreboot -> SeaBIOS -> UEFI OS sans/without CSM feature ON? The same one I have after bringing on UEFI 32/64 BIOS UEFI 32/64 OS (CSM is OFF always)? Thank you, Zoran -----Original Message----- From: Kevin O'Connor [mailto:kevin@koconnor.net] Sent: Saturday, December 19, 2015 2:39 AM To: Stojsavljevic, Zoran Cc: coreboot; seabios@seabios.org; Sun, Jiming Subject: Re: [SeaBIOS] 5 basic features provided by CSM, which SeaBIOS does provide? On Fri, Dec 18, 2015 at 08:43:37AM +0000, Stojsavljevic, Zoran wrote:
Hello both lists, Jiming,
There are 5 basic features, provided by CSM SeaBIOS payload, and I am looking to list of these features.
Could you, please, provide to me list of these features, and some description, and/or pointer to these descriptions?
I don't fully understand your question. One can build SeaBIOS as a Compatibility Support Module (CSM) for UEFI, and this has been tested with OVMF on virtual machines. It's theoretically also possible to use it as a CSM on real hardware with a UEFI payload on coreboot, but to the best of my knowledge that has never been tested. When SeaBIOS is used as a CSM module, it provides legacy 16bit BIOS support on UEFI machines to bootloaders and option roms that require that support. The only link I have for SeaBIOS CSM is: http://www.seabios.org/Build_overview#Build_as_a_UEFI_Compatibility_Support_... Cheers, -Kevin Intel Deutschland GmbH Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany Tel: +49 89 99 8853-0, www.intel.de Managing Directors: Christin Eisenschmid, Christian Lamprechter Chairperson of the Supervisory Board: Nicole Lau Registered Office: Munich Commercial Register: Amtsgericht Muenchen HRB 186928
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Kevin O'Connor -
Stojsavljevic, Zoran