[EXTERNAL] Re: BMC update via TFTP

[Lei YU]

On Wed, Dec 11, 2019 at 12:58 PM Bonnie Lo/WYHQ/Wiwynn
<Bonnie_Lo at wiwynn.com> wrote:
>
> Dear Joseph,
>
> In my understanding, the BMC firmware update flow is as below:
> 1. Trigger reboot
> 2. Systemd stop all service
> 3. Unmount file system
> 4. image is in /run/initramfs
> 5. Do the flashcp command to update the flash
>
> If there is any misunderstanding, please correct me.
>
> Based on the discussion with Neeraj.
> We want to be able to update BMC firmware without having to trigger the BMC reboot command before the system do flashcp command.
> It means that we can do the flashcp first. If the flashcp command complete and success, then we do the reset manually.
> Is it workable on current upstream code?
> If not, why? I means is there any advantage to trigger the reboot before we do the flashcp.

It is not safe to flashcp the flash chip while BMC is running on it,
because BMC's filesystem is mounted on the flash's RO and RW
partitions.