sod/amd/cezanne: Use LZ4 for FSP-M when using SPI DMA
This change adds about 30 KiB to FSP-M. When not using the SPI DMA
controller, this change actually has a ~7 ms boot time penalty. When
we use the DMA engine, we end up with about a 5 ms decrease. Once we
switch to 100 MHz SPI this will help even more since we have effectively
eliminated the decompression time.
BUG=b:179699789
TEST=Boot nipperkin to OS and take boot time measurements
fspm.bin 0x2efc0 fsp 90953 LZMA (233472 decompressed)
fspm.bin 0x2cfc0 fsp 121156 LZ4 (233472 decompressed)
- FSP-M / no async -
| 508 - finished loading body | 177.019 | 179.384 Δ( 2.36, 0.16%) |
...
| 970 - loading FSP-M | 0.346 | 0.346 Δ( 0.00, 0.00%) |
| 17 - starting LZ4 decompress (ignore for x86) | 0.009 | 0.01 Δ( 0.00, 0.00%) |
| 18 - finished LZ4 decompress (ignore for x86) | 53.916 | 59.475 Δ( 5.56, 0.37%) |
- FSP-M / async -
| 508 - finished loading body | 177.185 | 179.689 Δ( 2.50, 0.18%) |
...
| 970 - loading FSP-M | 0.989 | 0.99 Δ( 0.00, 0.00%) |
| 17 - starting LZ4 decompress (ignore for x86) | 9.483 | 12.877 Δ( 3.39, 0.24%) |
| 18 - finished LZ4 decompress (ignore for x86) | 10.833 | 0.312 Δ(-10.52, -0.75%) |
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I7d0363d27d98d4ed3afc6f802a13ff7986391921
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59029
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Rob Barnes <robbarnes@google.com>
diff --git a/src/soc/amd/cezanne/Kconfig b/src/soc/amd/cezanne/Kconfig
index aaa3811..3fb5085 100644
--- a/src/soc/amd/cezanne/Kconfig
+++ b/src/soc/amd/cezanne/Kconfig
@@ -20,7 +20,8 @@
select DRIVERS_USB_ACPI
select DRIVERS_I2C_DESIGNWARE
select DRIVERS_USB_PCI_XHCI
- select FSP_COMPRESS_FSP_M_LZMA
+ select FSP_COMPRESS_FSP_M_LZMA if !ASYNC_FILE_LOADING
+ select FSP_COMPRESS_FSP_M_LZ4 if ASYNC_FILE_LOADING
select FSP_COMPRESS_FSP_S_LZ4
select GENERIC_GPIO_LIB
select HAVE_ACPI_TABLES