coreboot-kgpe-d16/payloads/libpayload
Nico Huber edcde0ba7a libpayload/uhci: Re-write UHCI RH driver w/ generic_hub API
This is a complete rewrite of the UHCI root-hub driver, based on
the xHCI one. We are doing things by the book as far as possible.
One special case is uhci_rh_reset_port() which does the reset se-
quencing that usually the hardware would do.

This abandons some quirks of the old driver:
* Ports are not disabled/re-enabled for every attachment anymore.
* We solely rely on the Connect Status Change bit to track changes.
* Further status changes are now deferred to the next polling round.

The latter fixes endless loops in combination with commit 7faff543da
(libpayload: usb: Detach unused USB devices).

Change-Id: I5211728775eb94dfc23fa82ebf00fe5c99039709
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75504
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
2023-06-12 17:00:28 +00:00
..
arch libpayload/arch/x86: Update API handling of CBTABLE handoff 2023-05-24 11:49:51 +00:00
bin libpayload: bin/lpgcc allow to call without files 2023-03-07 17:10:36 +00:00
configs payloads/libpayload/configs: drop config.galileo 2023-05-27 00:26:59 +00:00
crypto
curses tree: Replace `egrep` with `grep -E` 2023-04-06 19:54:44 +00:00
drivers libpayload/uhci: Re-write UHCI RH driver w/ generic_hub API 2023-06-12 17:00:28 +00:00
gdb
include libpayload: strings.h: Use builtin __ffs instead of included one 2023-03-07 17:11:05 +00:00
libc
libcbfs
liblz4
liblzma
libpci
sample
tests
vboot
.gitignore
Doxyfile
Kconfig libpayload;arch,cpu/x86: drop USE_MARCH_586 Kconfig option 2023-05-27 00:29:02 +00:00
LICENSES
LICENSE_GPL
Makefile
Makefile.inc
Makefile.payload
README

README

-------------------------------------------------------------------------------
libpayload README
-------------------------------------------------------------------------------

libpayload is a minimal library to support standalone payloads
that can be booted with firmware like coreboot. It handles the setup
code, and provides common C library symbols such as malloc() and printf().

Note: This is _not_ a standard library for use with an operating system,
rather it's only useful for coreboot payload development!
See https://www.coreboot.org for details on coreboot.


Installation
------------

 $ git clone https://review.coreboot.org/coreboot.git

 $ cd coreboot/payloads/libpayload

 $ make menuconfig

 $ make

 $ make install (optional, will install into ./install per default)

On x86 systems, libpayload will always be 32-bit even if your host OS runs
in 64-bit, so you might have to install the 32-bit libgcc version.
On Debian systems you'd do 'apt-get install gcc-multilib' for example.

Run 'make distclean' before switching boards. This command will remove
your current .config file, so you need 'make menuconfig' again or
'make defconfig' in order to set up configuration. Default configuration
is based on 'configs/defconfig'. See the configs/ directory for examples
of configuration.


Usage
-----

Here's an example of a very simple payload (hello.c) and how to build it:

 #include <libpayload.h>

 int main(void)
 {
     printf("Hello, world!\n");
     return 0;
 }

Building the payload using the 'lpgcc' compiler wrapper:

 $ lpgcc -o hello.elf hello.c

Please see the sample/ directory for details.


Website and Mailing List
------------------------

The main website is https://www.coreboot.org/Libpayload.

For additional information, patches, and discussions, please join the
coreboot mailing list at https://www.coreboot.org/Mailinglist, where most
libpayload developers are subscribed.


Copyright and License
---------------------

See LICENSES.