[SeaBIOS] [Qemu-devel] SeaBIOS booting time optimization

[Kevin O'Connor]

On Mon, Nov 19, 2018 at 07:38:39PM +0100, Stefano Garzarella wrote:
> just an update, I enabled the debug prints and I saw two timeouts fired
> with a lot
> of time lost (~780ms between "init timer" and "Scan for VGA ..."),
> putting other prints I discovered that a lot of time is spent in the
> tpm_setup(),
> during the probe of the 2 TPM devices:
> 
> 00.548869 init timer
> 00.549677 ./src/post.c:157 platform_hardware_setup
> 00.550182 ./src/hw/tpm_drivers.c:579 tpmhw_probe
> 01.300833 WARNING - Timeout at wait_reg8:81!
> 01.301388 ./src/hw/tpm_drivers.c:579 tpmhw_probe
> 01.331843 WARNING - Timeout at wait_reg8:81!
> 01.332316 ./src/post.c:160 platform_hardware_setup
> 01.333358 Scan for VGA option rom

FYI, this was raised a few months ago - see:

https://mail.coreboot.org/pipermail/seabios/2018-March/012186.html

IIRC, it should be possible to verify the TPM device is present before
trying to wait for it.

-Kevin