commit | 66757b121ab39b168f1059932797f80bc512c35a | [log] [tgz] |
---|---|---|
author | Ivy Jian <ivy.jian@quanta.corp-partner.google.com> | Mon Sep 05 11:30:48 2022 +0800 |
committer | Subrata Banik <subratabanik@google.com> | Thu Sep 08 16:00:04 2022 +0000 |
tree | cf10aedfa7cbdad98431beea398cbcae9b44b50e | |
parent | d29b4aef1c110a04c1a03b44d5040b5702d02738 [diff] |
mb/google/rex: Add WWAN poweron sequencing The PCIe WWAN module used on rex requires control over 4 signals to successfully power it on. It is desirable to do this before passing control to the payload, because the modem requires a ~10 seconds initialization phase before it can be used. The corrected sequence looks like: 1) Drive device into full reset and enable power in bootblock 2) Deassert FCPO in romstage, after power rails stabilize 3) Deassert WWAN_RST#, then WWAN_PERST# in ramstage BUG=b:244077118 TEST=FM350 could be enumerated via lspci Measured signals to check start-up Timing Sequence, tpr/ton1/ton2. Tpr = 572mS Ton1 = 6.3s Ton2 = 6.3+4.17ms Signed-off-by: Ivy Jian <ivy.jian@quanta.corp-partner.google.com> Change-Id: I6cda9348ef7f54efe5ba2358040596a1c2da1b13 Reviewed-on: https://review.coreboot.org/c/coreboot/+/67332 Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com> Reviewed-by: Subrata Banik <subratabanik@google.com> Reviewed-by: Tarun Tuli <taruntuli@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload.
With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required.
coreboot was formerly known as LinuxBIOS.
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
ANY_TOOLCHAIN
Kconfig option if you're feeling lucky (no support in this case).Optional:
make menuconfig
and make nconfig
)Please consult https://www.coreboot.org/Build_HOWTO for details.
If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU.
Please see https://www.coreboot.org/QEMU for details.
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
https://www.coreboot.org/Mailinglist
The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details.
coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details.
This makes the resulting coreboot images licensed under the GPL, version 2.