Revision as of 00:57, 16 January 2016

Chrome EC

The Chrome EC is used in almost all Chrome OS devices, and an increasing number of accessories, like Google's Type C chargers. It is based on the Chromium EC code base.

Building the Chrome EC

Building in the ChromiumOS environment

Getting started building EC images quickly

Building outside of the ChromiumOS chroot

Build requirements

You will need:

GNU Make 4.1 (older versions are having trouble with the Makefiles)
an ARM cross compiler (I used coreboot's armv7-a-eabi- toolchain)

Patches required

Patching up the code:

diff --git a/Makefile.toolchain b/Makefile.toolchain
index f015726..759dfb0 100644
--- a/Makefile.toolchain
+++ b/Makefile.toolchain
@@ -48,6 +48,9 @@ CFLAGS=$(CPPFLAGS) $(CFLAGS_CPU) $(CFLAGS_DEBUG) $(CFLAGS_WARN) $(CFLAGS_y)
 CFLAGS+= -ffunction-sections -fshort-wchar
 CFLAGS+= -fno-delete-null-pointer-checks -fconserve-stack
 
+CFLAGS+= -ffreestanding
+CPPFLAGS+= -ffreestanding
+
 FTDIVERSION=$(shell $(PKG_CONFIG) --modversion libftdi1 2>/dev/null)
 ifneq ($(FTDIVERSION),)
   LIBFTDI_NAME=ftdi1

and

diff --git a/include/timer.h b/include/timer.h
index 5f92207..1a43604 100644
--- a/include/timer.h
+++ b/include/timer.h
@@ -8,7 +8,7 @@
 #ifndef __CROS_EC_TIMER_H
 #define __CROS_EC_TIMER_H
 
-#include <sys/types.h>
+typedef long clock_t;
 
 #include "common.h"
 #include "task_id.h"

and

diff --git a/driver/pi3usb30532.h b/driver/pi3usb30532.h
index 96c9632..15a9241 100644
--- a/driver/pi3usb30532.h
+++ b/driver/pi3usb30532.h
@@ -8,8 +8,6 @@
 #ifndef __CROS_EC_PI3USB30532_H
 #define __CROS_EC_PI3USB30532_H
 
-#include <inttypes.h>
-
 #include "usb_pd.h"
 
 /* USB switch registers */

and

diff --git a/driver/als_si114x.c b/driver/als_si114x.c
index bdd39fa..5a64be9 100644
--- a/driver/als_si114x.c
+++ b/driver/als_si114x.c
@@ -219,7 +219,7 @@ static int irq_handler(struct motion_sensor_t *s, uint32_t *event)
 /* Just trigger a measurement */
 static int read(const struct motion_sensor_t *s, vector_3_t v)
 {
-       int ret;
+       int ret = 0;
        uint8_t cmd;
        struct si114x_drv_data_t *data = SI114X_GET_DATA(s);

Build instructions

Let's go:

$ sudo aptitude install libftdi-dev
$ git clone https://chromium.googlesource.com/chromiumos/platform/vboot_reference
$ cd vboot_reference
$ make
[..]
$ cp build/futility/futility ~/bin
$ cd ..
$ git clone https://chromium.googlesource.com/chromiumos/platform/ec
[..]
$ cd ec
$ CROSS_COMPILE=armv7-a-eabi- HOST_CROSS_COMPILE= make BOARD=chell
[..]
$

Issues

Targets not building

cr50 (make issue)
glados,kunimitsu,lars,oak: driver/pi3usb30532.h:11:22: fatal error: inttypes.h: No such file or directory
it8380dev: armv7-a-eabi-gcc: error: unrecognized argument in option '-march=v3m'
ryu: driver/als_si114x.c:269:5: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
Not real targets, but in board/: host, OWNERS

Chrome EC: Difference between revisions