--- /dev/null
+/*
+ * f_dfu.c -- Device Firmware Update USB function
+ *
+ * Copyright (C) 2012 Samsung Electronics
+ * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <errno.h>
+#include <common.h>
+#include <malloc.h>
+
+#include <linux/usb/ch9.h>
+#include <usbdescriptors.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/composite.h>
+
+#include <dfu.h>
+#include "f_dfu.h"
+
+struct f_dfu {
+ struct usb_function usb_function;
+
+ struct usb_descriptor_header **function;
+ struct usb_string *strings;
+
+ /* when configured, we have one config */
+ u8 config;
+ u8 altsetting;
+ enum dfu_state dfu_state;
+ unsigned int dfu_status;
+
+ /* Send/received block number is handy for data integrity check */
+ int blk_seq_num;
+};
+
+typedef int (*dfu_state_fn) (struct f_dfu *,
+ const struct usb_ctrlrequest *,
+ struct usb_gadget *,
+ struct usb_request *);
+
+static inline struct f_dfu *func_to_dfu(struct usb_function *f)
+{
+ return container_of(f, struct f_dfu, usb_function);
+}
+
+static const struct dfu_function_descriptor dfu_func = {
+ .bLength = sizeof dfu_func,
+ .bDescriptorType = DFU_DT_FUNC,
+ .bmAttributes = DFU_BIT_WILL_DETACH |
+ DFU_BIT_MANIFESTATION_TOLERANT |
+ DFU_BIT_CAN_UPLOAD |
+ DFU_BIT_CAN_DNLOAD,
+ .wDetachTimeOut = 0,
+ .wTransferSize = DFU_USB_BUFSIZ,
+ .bcdDFUVersion = __constant_cpu_to_le16(0x0110),
+};
+
+static struct usb_interface_descriptor dfu_intf_runtime = {
+ .bLength = sizeof dfu_intf_runtime,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 0,
+ .bInterfaceClass = USB_CLASS_APP_SPEC,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 1,
+ /* .iInterface = DYNAMIC */
+};
+
+static struct usb_descriptor_header *dfu_runtime_descs[] = {
+ (struct usb_descriptor_header *) &dfu_intf_runtime,
+ NULL,
+};
+
+static const struct usb_qualifier_descriptor dev_qualifier = {
+ .bLength = sizeof dev_qualifier,
+ .bDescriptorType = USB_DT_DEVICE_QUALIFIER,
+ .bcdUSB = __constant_cpu_to_le16(0x0200),
+ .bDeviceClass = USB_CLASS_VENDOR_SPEC,
+ .bNumConfigurations = 1,
+};
+
+static const char dfu_name[] = "Device Firmware Upgrade";
+
+/*
+ * static strings, in UTF-8
+ *
+ * dfu_generic configuration
+ */
+static struct usb_string strings_dfu_generic[] = {
+ [0].s = dfu_name,
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dfu_generic = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_dfu_generic,
+};
+
+static struct usb_gadget_strings *dfu_generic_strings[] = {
+ &stringtab_dfu_generic,
+ NULL,
+};
+
+/*
+ * usb_function specific
+ */
+static struct usb_gadget_strings stringtab_dfu = {
+ .language = 0x0409, /* en-us */
+ /*
+ * .strings
+ *
+ * assigned during initialization,
+ * depends on number of flash entities
+ *
+ */
+};
+
+static struct usb_gadget_strings *dfu_strings[] = {
+ &stringtab_dfu,
+ NULL,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static void dnload_request_complete(struct usb_ep *ep, struct usb_request *req)
+{
+ struct f_dfu *f_dfu = req->context;
+
+ dfu_write(dfu_get_entity(f_dfu->altsetting), req->buf,
+ req->length, f_dfu->blk_seq_num);
+
+ if (req->length == 0)
+ puts("DOWNLOAD ... OK\nCtrl+C to exit ...\n");
+}
+
+static void handle_getstatus(struct usb_request *req)
+{
+ struct dfu_status *dstat = (struct dfu_status *)req->buf;
+ struct f_dfu *f_dfu = req->context;
+
+ switch (f_dfu->dfu_state) {
+ case DFU_STATE_dfuDNLOAD_SYNC:
+ case DFU_STATE_dfuDNBUSY:
+ f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_IDLE;
+ break;
+ case DFU_STATE_dfuMANIFEST_SYNC:
+ break;
+ default:
+ break;
+ }
+
+ /* send status response */
+ dstat->bStatus = f_dfu->dfu_status;
+ dstat->bState = f_dfu->dfu_state;
+ dstat->iString = 0;
+}
+
+static void handle_getstate(struct usb_request *req)
+{
+ struct f_dfu *f_dfu = req->context;
+
+ ((u8 *)req->buf)[0] = f_dfu->dfu_state;
+ req->actual = sizeof(u8);
+}
+
+static inline void to_dfu_mode(struct f_dfu *f_dfu)
+{
+ f_dfu->usb_function.strings = dfu_strings;
+ f_dfu->usb_function.hs_descriptors = f_dfu->function;
+}
+
+static inline void to_runtime_mode(struct f_dfu *f_dfu)
+{
+ f_dfu->usb_function.strings = NULL;
+ f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
+}
+
+static int handle_upload(struct usb_request *req, u16 len)
+{
+ struct f_dfu *f_dfu = req->context;
+
+ return dfu_read(dfu_get_entity(f_dfu->altsetting), req->buf,
+ req->length, f_dfu->blk_seq_num);
+}
+
+static int handle_dnload(struct usb_gadget *gadget, u16 len)
+{
+ struct usb_composite_dev *cdev = get_gadget_data(gadget);
+ struct usb_request *req = cdev->req;
+ struct f_dfu *f_dfu = req->context;
+
+ if (len == 0)
+ f_dfu->dfu_state = DFU_STATE_dfuMANIFEST_SYNC;
+
+ req->complete = dnload_request_complete;
+
+ return len;
+}
+
+/*-------------------------------------------------------------------------*/
+/* DFU state machine */
+static int state_app_idle(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ case USB_REQ_DFU_DETACH:
+ f_dfu->dfu_state = DFU_STATE_appDETACH;
+ to_dfu_mode(f_dfu);
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ value = RET_ZLP;
+ break;
+ default:
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_app_detach(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_appIDLE;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_idle(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_DNLOAD:
+ if (len == 0) {
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+ f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
+ f_dfu->blk_seq_num = w_value;
+ value = handle_dnload(gadget, len);
+ break;
+ case USB_REQ_DFU_UPLOAD:
+ f_dfu->dfu_state = DFU_STATE_dfuUPLOAD_IDLE;
+ f_dfu->blk_seq_num = 0;
+ value = handle_upload(req, len);
+ break;
+ case USB_REQ_DFU_ABORT:
+ /* no zlp? */
+ value = RET_ZLP;
+ break;
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ case USB_REQ_DFU_DETACH:
+ /*
+ * Proprietary extension: 'detach' from idle mode and
+ * get back to runtime mode in case of USB Reset. As
+ * much as I dislike this, we just can't use every USB
+ * bus reset to switch back to runtime mode, since at
+ * least the Linux USB stack likes to send a number of
+ * resets in a row :(
+ */
+ f_dfu->dfu_state =
+ DFU_STATE_dfuMANIFEST_WAIT_RST;
+ to_runtime_mode(f_dfu);
+ f_dfu->dfu_state = DFU_STATE_appIDLE;
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_dnload_sync(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_dnbusy(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_dnload_idle(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_DNLOAD:
+ f_dfu->dfu_state = DFU_STATE_dfuDNLOAD_SYNC;
+ f_dfu->blk_seq_num = w_value;
+ value = handle_dnload(gadget, len);
+ break;
+ case USB_REQ_DFU_ABORT:
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ value = RET_ZLP;
+ break;
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_manifest_sync(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ /* We're MainfestationTolerant */
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ handle_getstatus(req);
+ f_dfu->blk_seq_num = 0;
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_upload_idle(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ u16 len = le16_to_cpu(ctrl->wLength);
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_UPLOAD:
+ /* state transition if less data then requested */
+ f_dfu->blk_seq_num = w_value;
+ value = handle_upload(req, len);
+ if (value >= 0 && value < len)
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ break;
+ case USB_REQ_DFU_ABORT:
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ /* no zlp? */
+ value = RET_ZLP;
+ break;
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static int state_dfu_error(struct f_dfu *f_dfu,
+ const struct usb_ctrlrequest *ctrl,
+ struct usb_gadget *gadget,
+ struct usb_request *req)
+{
+ int value = 0;
+
+ switch (ctrl->bRequest) {
+ case USB_REQ_DFU_GETSTATUS:
+ handle_getstatus(req);
+ value = RET_STAT_LEN;
+ break;
+ case USB_REQ_DFU_GETSTATE:
+ handle_getstate(req);
+ break;
+ case USB_REQ_DFU_CLRSTATUS:
+ f_dfu->dfu_state = DFU_STATE_dfuIDLE;
+ f_dfu->dfu_status = DFU_STATUS_OK;
+ /* no zlp? */
+ value = RET_ZLP;
+ break;
+ default:
+ f_dfu->dfu_state = DFU_STATE_dfuERROR;
+ value = RET_STALL;
+ break;
+ }
+
+ return value;
+}
+
+static dfu_state_fn dfu_state[] = {
+ state_app_idle, /* DFU_STATE_appIDLE */
+ state_app_detach, /* DFU_STATE_appDETACH */
+ state_dfu_idle, /* DFU_STATE_dfuIDLE */
+ state_dfu_dnload_sync, /* DFU_STATE_dfuDNLOAD_SYNC */
+ state_dfu_dnbusy, /* DFU_STATE_dfuDNBUSY */
+ state_dfu_dnload_idle, /* DFU_STATE_dfuDNLOAD_IDLE */
+ state_dfu_manifest_sync, /* DFU_STATE_dfuMANIFEST_SYNC */
+ NULL, /* DFU_STATE_dfuMANIFEST */
+ NULL, /* DFU_STATE_dfuMANIFEST_WAIT_RST */
+ state_dfu_upload_idle, /* DFU_STATE_dfuUPLOAD_IDLE */
+ state_dfu_error /* DFU_STATE_dfuERROR */
+};
+
+static int
+dfu_handle(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
+{
+ struct usb_gadget *gadget = f->config->cdev->gadget;
+ struct usb_request *req = f->config->cdev->req;
+ struct f_dfu *f_dfu = f->config->cdev->req->context;
+ u16 len = le16_to_cpu(ctrl->wLength);
+ u16 w_value = le16_to_cpu(ctrl->wValue);
+ int value = 0;
+ u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
+
+ debug("w_value: 0x%x len: 0x%x\n", w_value, len);
+ debug("req_type: 0x%x ctrl->bRequest: 0x%x f_dfu->dfu_state: 0x%x\n",
+ req_type, ctrl->bRequest, f_dfu->dfu_state);
+
+ if (req_type == USB_TYPE_STANDARD) {
+ if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR &&
+ (w_value >> 8) == DFU_DT_FUNC) {
+ value = min(len, (u16) sizeof(dfu_func));
+ memcpy(req->buf, &dfu_func, value);
+ }
+ } else /* DFU specific request */
+ value = dfu_state[f_dfu->dfu_state] (f_dfu, ctrl, gadget, req);
+
+ if (value >= 0) {
+ req->length = value;
+ req->zero = value < len;
+ value = usb_ep_queue(gadget->ep0, req, 0);
+ if (value < 0) {
+ debug("ep_queue --> %d\n", value);
+ req->status = 0;
+ }
+ }
+
+ return value;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int
+dfu_prepare_strings(struct f_dfu *f_dfu, int n)
+{
+ struct dfu_entity *de = NULL;
+ int i = 0;
+
+ f_dfu->strings = calloc(sizeof(struct usb_string), n + 1);
+ if (!f_dfu->strings)
+ goto enomem;
+
+ for (i = 0; i < n; ++i) {
+ de = dfu_get_entity(i);
+ f_dfu->strings[i].s = de->name;
+ }
+
+ f_dfu->strings[i].id = 0;
+ f_dfu->strings[i].s = NULL;
+
+ return 0;
+
+enomem:
+ while (i)
+ f_dfu->strings[--i].s = NULL;
+
+ free(f_dfu->strings);
+
+ return -ENOMEM;
+}
+
+static int dfu_prepare_function(struct f_dfu *f_dfu, int n)
+{
+ struct usb_interface_descriptor *d;
+ int i = 0;
+
+ f_dfu->function = calloc(sizeof(struct usb_descriptor_header *), n);
+ if (!f_dfu->function)
+ goto enomem;
+
+ for (i = 0; i < n; ++i) {
+ d = calloc(sizeof(*d), 1);
+ if (!d)
+ goto enomem;
+
+ d->bLength = sizeof(*d);
+ d->bDescriptorType = USB_DT_INTERFACE;
+ d->bAlternateSetting = i;
+ d->bNumEndpoints = 0;
+ d->bInterfaceClass = USB_CLASS_APP_SPEC;
+ d->bInterfaceSubClass = 1;
+ d->bInterfaceProtocol = 2;
+
+ f_dfu->function[i] = (struct usb_descriptor_header *)d;
+ }
+ f_dfu->function[i] = NULL;
+
+ return 0;
+
+enomem:
+ while (i) {
+ free(f_dfu->function[--i]);
+ f_dfu->function[i] = NULL;
+ }
+ free(f_dfu->function);
+
+ return -ENOMEM;
+}
+
+static int dfu_bind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct usb_composite_dev *cdev = c->cdev;
+ struct f_dfu *f_dfu = func_to_dfu(f);
+ int alt_num = dfu_get_alt_number();
+ int rv, id, i;
+
+ id = usb_interface_id(c, f);
+ if (id < 0)
+ return id;
+ dfu_intf_runtime.bInterfaceNumber = id;
+
+ f_dfu->dfu_state = DFU_STATE_appIDLE;
+ f_dfu->dfu_status = DFU_STATUS_OK;
+
+ rv = dfu_prepare_function(f_dfu, alt_num);
+ if (rv)
+ goto error;
+
+ rv = dfu_prepare_strings(f_dfu, alt_num);
+ if (rv)
+ goto error;
+ for (i = 0; i < alt_num; i++) {
+ id = usb_string_id(cdev);
+ if (id < 0)
+ return id;
+ f_dfu->strings[i].id = id;
+ ((struct usb_interface_descriptor *)f_dfu->function[i])
+ ->iInterface = id;
+ }
+
+ stringtab_dfu.strings = f_dfu->strings;
+
+ cdev->req->context = f_dfu;
+
+error:
+ return rv;
+}
+
+static void dfu_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+ struct f_dfu *f_dfu = func_to_dfu(f);
+ int alt_num = dfu_get_alt_number();
+ int i;
+
+ if (f_dfu->strings) {
+ i = alt_num;
+ while (i)
+ f_dfu->strings[--i].s = NULL;
+
+ free(f_dfu->strings);
+ }
+
+ if (f_dfu->function) {
+ i = alt_num;
+ while (i) {
+ free(f_dfu->function[--i]);
+ f_dfu->function[i] = NULL;
+ }
+ free(f_dfu->function);
+ }
+
+ free(f_dfu);
+}
+
+static int dfu_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+ struct f_dfu *f_dfu = func_to_dfu(f);
+
+ debug("%s: intf:%d alt:%d\n", __func__, intf, alt);
+
+ f_dfu->altsetting = alt;
+
+ return 0;
+}
+
+/* TODO: is this really what we need here? */
+static void dfu_disable(struct usb_function *f)
+{
+ struct f_dfu *f_dfu = func_to_dfu(f);
+ if (f_dfu->config == 0)
+ return;
+
+ debug("%s: reset config\n", __func__);
+
+ f_dfu->config = 0;
+}
+
+static int dfu_bind_config(struct usb_configuration *c)
+{
+ struct f_dfu *f_dfu;
+ int status;
+
+ f_dfu = calloc(sizeof(*f_dfu), 1);
+ if (!f_dfu)
+ return -ENOMEM;
+ f_dfu->usb_function.name = "dfu";
+ f_dfu->usb_function.hs_descriptors = dfu_runtime_descs;
+ f_dfu->usb_function.bind = dfu_bind;
+ f_dfu->usb_function.unbind = dfu_unbind;
+ f_dfu->usb_function.set_alt = dfu_set_alt;
+ f_dfu->usb_function.disable = dfu_disable;
+ f_dfu->usb_function.strings = dfu_generic_strings,
+ f_dfu->usb_function.setup = dfu_handle,
+
+ status = usb_add_function(c, &f_dfu->usb_function);
+ if (status)
+ free(f_dfu);
+
+ return status;
+}
+
+int dfu_add(struct usb_configuration *c)
+{
+ int id;
+
+ id = usb_string_id(c->cdev);
+ if (id < 0)
+ return id;
+ strings_dfu_generic[0].id = id;
+ dfu_intf_runtime.iInterface = id;
+
+ debug("%s: cdev: 0x%p gadget:0x%p gadget->ep0: 0x%p\n", __func__,
+ c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
+
+ return dfu_bind_config(c);
+}
projects / u-boot / commitdiff