Hi, We have a gpio which could control the MUX When I want to do BIOS upgrade, I will shut down the host and operate the gpio, and rescan, then BIOS flash will be accessible from BMC now. B.R. Medad From: Oskar Senft Sent: Wednesday, December 18, 2019 4:57 AM To: CS20 CTCchien Cc: Vijay Khemka ; OpenBMC Maillist Subject: Re: Bios upgrade Hi How did you configure the BIOS flash device? I assume via the device tree? I haven't tested this in a while, but I seem to remember that if the BIOS SPI flash is not accessible Linux doesn't "detect" the device and doesn't create the MTD, i.e. it's not accessible from the BMC. This can be the case if the mux between BMC, PCH and BIOS SPI flash) is configured to connect the SPI flash to the BMC at the time the BMC boots. Or is there a way to make BMC's Linux "rescan" for SPI flash chips at runtime? Thanks Oskar. On Tue, Dec 17, 2019 at 12:38 AM CS20 CTCchien > wrote: Hi Vijay, You could build a host daemon and a ipmi library on BMC from phosphor-ipmi-flash Here is the link I implement BIOS upgrade on my system https://github.com/Nuvoton-Israel/openbmc/tree/runbmc/meta-phosphor/nuvoton-layer/recipes-phosphor/ipmi. You need to prepare a BIOS image and a signature file for this BIOS After you execute the command on host, ipmid in BMC will launch a script to upgrade BIOS. For example, sudo ./burn_my_bmc --command update --interface ipmipci --image BIOS.img --sig BIOS.img.sig --type static B.R. Medad From: Vijay Khemka > Sent: Tuesday, December 17, 2019 8:16 AM To: OpenBMC Maillist > Subject: Bios upgrade Hi, I am looking for bios upgrade from BMC. I looked at phosphor-ipmi-flash but couldn’t figure out how to use this for bios upgrade. I checked few old mails where oskar was asking about using user space application instead of kernel. Can anyone please give steps to use any existing kernel driver or user space Application for upgrading host firmware. Regards -Vijay ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton. ________________________________ The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Nuvoton is strictly prohibited; and any information in this email irrelevant to the official business of Nuvoton shall be deemed as neither given nor endorsed by Nuvoton.