Change in coreboot[master]: soc/amd/cezanne: Start loading APOB asynchronously

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Felix Held.
Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56234 )

Change subject: soc/amd/cezanne: Start loading APOB asynchronously
......................................................................

soc/amd/cezanne: Start loading APOB asynchronously

This enabled COOP_MULTITASKING (i.e., multiple stacks single CPU). This
will allow the APOB to start loading async while ramstage progresses
through the state machine.

BUG=b:179699789
TEST=Boot guybrush and verify APOB read timestamp has dropped from 10ms
to a few uS.

Starting APOB preload
APOB thread running
spi_dma_readat_dma: start: dest: 0xcb7aa640, offset: 0x0, size: 65536
 took 0 us to acquire mutex
start_spi_dma_transaction: dest: 0xcb7aa640, offset: 0x0, remaining: 65536

<ramstage doing work>

spi_dma_readat_dma: end: dest: 0xcb7aa640, offset: 0x0, size: 65536, remaining: 0

<more work..>

waiting for thread
 took 0 us
APOB valid copy is already in flash

Signed-off-by: Raul E Rangel 
Change-Id: I4b5c1ef4cad571d1cbca33b1aff017a3cedc1bea
---
M src/soc/amd/cezanne/Kconfig
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/56234/1

diff --git a/src/soc/amd/cezanne/Kconfig b/src/soc/amd/cezanne/Kconfig
index 8f93512..89b068e 100644
--- a/src/soc/amd/cezanne/Kconfig
+++ b/src/soc/amd/cezanne/Kconfig
@@ -18,6 +18,7 @@
    select BOOT_DEVICE_SUPPORTS_WRITES if BOOT_DEVICE_SPI_FLASH
    select DRIVERS_USB_ACPI
    select DRIVERS_I2C_DESIGNWARE
+	select COOP_MULTITASKING
    select DRIVERS_USB_PCI_XHCI
    select FSP_COMPRESS_FSP_M_LZMA
    select FSP_COMPRESS_FSP_S_LZMA
@@ -68,6 +69,7 @@
    select SOC_AMD_COMMON_FSP_DMI_TABLES
    select SOC_AMD_COMMON_FSP_PCI
    select SSE2
+	select TIMER_QUEUE
    select UDK_2017_BINDING
    select X86_AMD_FIXED_MTRRS
    select X86_AMD_INIT_SIPI