diff options
| author | Ronald G. Minnich <rminnich@gmail.com> | 2019-10-22 02:02:24 +0000 |
|---|---|---|
| committer | ron minnich <rminnich@gmail.com> | 2020-02-08 18:57:36 +0000 |
| commit | 466ca2c1adbf2fc97dd559a3b69fcf0c7fe5d472 (patch) | |
| tree | 24c665b13fe23e8e6be540ef917d1c23ad175309 /util/sconfig/sconfig.l | |
| parent | 91dc1e74a52ec33dc7f5c33dca73f02c5fe54cf0 (diff) | |
| download | coreboot-466ca2c1adbf2fc97dd559a3b69fcf0c7fe5d472.tar.xz | |
Add configurable ramstage support for minimal PCI scanning
This CL has changes that allow us to enable a configurable
ramstage, and one change that allows us to minimize PCI
scanning. Minimal scanning is a frequently requested feature.
To enable it, we add two new variables to src/Kconfig
CONFIGURABLE_RAMSTAGE
is the overall variable controlling other options for minimizing the
ramstage.
MINIMAL_PCI_SCANNING is how we indicate we wish to enable minimal
PCI scanning.
Some devices must be scanned in all cases, such as 0:0.0.
To indicate which devices we must scan, we add a new mandatory
keyword to sconfig
It is used in place of on, off, or hidden, and indicates
a device is enabled and mandatory. Mandatory
devices are always scanned. When MINIMAL_PCI_SCANNING is enabled,
ONLY mandatory devices are scanned.
We further add support in src/device/pci_device.c to manage
both MINIMAL_PCI_SCANNING and mandatory devices.
Finally, to show how this works in practice, we add mandatory
keywords to 3 devices on the qemu-q35.
TEST=
1. This is tested and working on the qemu-q35 target.
2. On CML-Hatch
Before CL:
Total Boot time: ~685ms
After CL:
Total Boot time: ~615ms
Change-Id: I2073d9f8e9297c2b02530821ebb634ea2a5c758e
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36221
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jeremy Soller <jeremy@system76.com>
Diffstat (limited to 'util/sconfig/sconfig.l')
| -rwxr-xr-x | util/sconfig/sconfig.l | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/util/sconfig/sconfig.l b/util/sconfig/sconfig.l index 87de6e2763..14eb965bdb 100755 --- a/util/sconfig/sconfig.l +++ b/util/sconfig/sconfig.l @@ -29,7 +29,8 @@ device {return(DEVICE);} register {return(REGISTER);} on {yylval.number=1; return(BOOL);} off {yylval.number=0; return(BOOL);} -hidden {yylval.number=3; return(HIDDEN);} +hidden {yylval.number=3; return(STATUS);} +mandatory {yylval.number=5; return(STATUS);} pci {yylval.number=PCI; return(BUS);} ioapic {yylval.number=IOAPIC; return(BUS);} pnp {yylval.number=PNP; return(BUS);} |