u-boot/arch/x86/cpu/slimbootloader/Kconfig
Simon Glass 77dd7c6854 x86: timer: use a timer base of 0
On x86 platforms the timer is reset to 0 when the SoC is reset. Having
this as the timer base is useful since it provides an indication of how
long it takes before U-Boot is running.

When U-Boot sets the timer base to something else, time is lost and we
no-longer have an accurate account of the time since reset. This
particularly affects bootstage.

Change the default to not read the timer base, leaving it at 0. Add an
option for when U-Boot is the secondary bootloader.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2019-12-15 11:44:09 +08:00

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# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (C) 2019 Intel Corporation <www.intel.com>
config SYS_SLIMBOOTLOADER
bool
select USE_HOB
imply SYS_NS16550
imply AHCI_PCI
imply SCSI
imply SCSI_AHCI
imply MMC
imply MMC_PCI
imply MMC_SDHCI
imply MMC_SDHCI_SDMA
imply USB
imply USB_EHCI_HCD
imply USB_XHCI_HCD
imply E1000
imply X86_TSC_READ_BASE