Files
system76-coreboot/payloads/libpayload
Julius Werner 57ddd9abc7 libpayload: usb: xhci: Count new Max Scratchpad Bufs bits from XHCI 1.1
The 1.1 revision of the XHCI specification added an extra 5 bits to the
Max Scratchpad Bufs field of HCSPARAMS2 that newer controllers make use
of. Not honoring these bits means we're not allocating as many
scratchpad buffers as the controller expects, which means it will
interpret some uninitialized values from the end of the pointer array as
scratchpad buffer pointers, which obviously doesn't end well. Let's fix
that.

BRANCH=none
BUG=chrome-os-partner:42279
TEST=Makes a USB-related memory corruption issue disappear.

Original-Change-Id: I7c907492339262bda31cdd2b5c0b588de7df8544
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/291681
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>

Change-Id: Iba1007bfebffe1f564f78bb875fff9ba0fe11a38
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/11189
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2015-08-14 15:17:30 +02:00
..
2015-08-10 20:29:07 +02:00
2015-05-21 20:50:25 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00
2015-06-08 00:55:07 +02:00

-------------------------------------------------------------------------------
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 http://coreboot.org for details on coreboot.


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

 $ git clone http://review.coreboot.org/p/coreboot.git

 $ cd coreboot/payloads/libpayload

 $ make menuconfig

 $ make

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

As libpayload is for 32bit x86 systems only, you might have to install the
32bit libgcc version, otherwise your payloads will fail to compile.
On Debian systems you'd do 'apt-get install gcc-multilib' for example.


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 http://www.coreboot.org/Libpayload.

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


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

See LICENSES.