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FSP-S is normally memmapped and then decompressed. There are about 7 ms
between starting ramstage, and loading FSP-S. By preloading we can
ensure the fsps.bin is already in RAM by the time we need it. This
reduces boot time by about 7 ms.
BUG=b:
TEST=Boot nipperkin and see ~7ms reduction in boot time
| 10 - start of ramstage | 0.044 | 0.044 Δ( 0.00, 0.00%) |
| 30 - device enumeration | 1.899 | 2.073 Δ( 0.17, 0.01%) |
| 971 - loading FSP-S | 6.645 | 6.628 Δ( -0.02, -0.00%) |
| 15 - starting LZMA decompress (ignore for x86) | 0.016 | 0.01 Δ( -0.01, -0.00%) |
| 16 - finished LZMA decompress (ignore for x86) | 15.266 | 8.316 Δ( -6.95, -0.47%) |
| 954 - calling FspSiliconInit | 0.08 | 0.09 Δ( 0.01, 0.00%) |
CBFS DEBUG: _cbfs_alloc(name='fsps.bin', alloc=0xc9761e5c(0xc97a3f0c), force_ro=false, type=-1)
CBFS: Found 'fsps.bin' @0x1a1fc0 size 0x102cd in mcache @0xc97dd208
waiting for thread
took 1 us <-- fsps.bin was preloaded
CBFS DEBUG: get_preload_rdev(name='fsps.bin') preload successful
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I5a728047b8ad92d70bba8485017579aa3df48d95
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59025
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Rob Barnes <robbarnes@google.com>
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