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DFU: add DFU application

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this adds the DFU as application, allowing to flash the bootloader.
a USB DFU alternative is added to flash the bootloader partition.

when the DFU is started as bootloader, the partition/alternative
to flash the bootloader is marked as "not available", and
ineffective.
the same happens for the application partition when DFU is started
as application.

this distinction is make at compile time, not at runtime, because
of size restrictions (the bootloader was already close to the
16 kB limit).
*_dfu_flash.bin should not be mixed with *_dfu_dfu.bin.
*_dfu_dfu.bin should be flashed as application using the already
existing DFU bootloader.
once this images is started (as application), the *_dfu_flash.bin
should be flashed as bootloader using the DFU application.

once the DFU bootloader has been flashed, soft resetting
(not re-powering) will cause the bootloader to start, allowing to
flash the application with a normal image (e.g. not DFU),
replacing the DFU application.
this switch to DFU only happens after downloading (e.g. flashing).

it is planned to have the DFU application erase itself after
flashing, but this is currently not implemented.

Change-Id: Ic273bb593a7669111b0219fe301d7897419167c8
This commit is contained in:
Kévin Redon
2019-12-11 17:04:21 +01:00
committed by laforge
parent 34200e4676
commit b6e2f0f8e7
9 changed files with 92 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
firmware/apps/dfu/main.c
View File

@@ -26,8 +26,15 @@
#include <osmocom/core/timer.h>
/* USB alternate interface index used to identify which partition to flash */
/** USB alternate interface index indicating RAM partition */
#define ALTIF_RAM 0
/** USB alternate interface index indicating flash partition */
#if defined(ENVIRONMENT_flash)
#define ALTIF_FLASH 1
#elif defined(ENVIRONMENT_dfu)
#define ALTIF_FLASH 2
#endif
unsigned int g_unique_id[4];
/* remember if the watchdog has been configured in the main loop so we can kick it in the ISR */
@@ -44,10 +51,18 @@ static const Pin pinsLeds[] = { PINS_LEDS } ;
*----------------------------------------------------------------------------*/
#define RAM_ADDR(offset) (IRAM_ADDR + BOARD_DFU_RAM_SIZE + offset)
#if defined(ENVIRONMENT_flash)
#define FLASH_ADDR(offset) (IFLASH_ADDR + BOARD_DFU_BOOT_SIZE + offset)
#elif defined(ENVIRONMENT_dfu)
#define FLASH_ADDR(offset) (IFLASH_ADDR + offset)
#endif
#define IFLASH_END ((uint8_t *)IFLASH_ADDR + IFLASH_SIZE)
#define IRAM_END ((uint8_t *)IRAM_ADDR + IRAM_SIZE)
#define IRAM_END ((uint8_t *)IRAM_ADDR + IRAM_SIZE)
#if defined(ENVIRONMENT_flash)
#define IFLASH_END ((uint8_t *)IFLASH_ADDR + IFLASH_SIZE)
#elif defined(ENVIRONMENT_dfu)
#define IFLASH_END ((uint8_t *)IFLASH_ADDR + BOARD_DFU_BOOT_SIZE)
#endif
/* incoming call-back: Host has transferred 'len' bytes (stored at
* 'data'), which we shall write to 'offset' into the partition
@@ -90,7 +105,11 @@ int USBDFU_handle_dnload(uint8_t altif, unsigned int offset,
break;
case ALTIF_FLASH:
addr = FLASH_ADDR(offset);
#if defined(ENVIRONMENT_flash)
if (addr < IFLASH_ADDR || addr + len >= IFLASH_ADDR + IFLASH_SIZE) {
#elif defined(ENVIRONMENT_dfu)
if (addr < IFLASH_ADDR || addr + len >= IFLASH_ADDR + BOARD_DFU_BOOT_SIZE) {
#endif
g_dfu->state = DFU_STATE_dfuERROR;
g_dfu->status = DFU_STATUS_errADDRESS;
rc = DFU_RET_STALL;
@@ -281,12 +300,12 @@ extern int main(void)
TRACE_INFO("DFU bootloader start reason: ");
switch (USBDFU_OverrideEnterDFU()) {
case 0:
/* 0 normally means that there is no override, but we are in the bootloader,
* thus the first check in board_cstartup_gnu did return something else than 0.
* this can only be g_dfu->magic which is erased when the segment are
* relocated, which happens in board_cstartup_gnu just after USBDFU_OverrideEnterDFU.
* no static variable can be used to store this case since this will also be overwritten
*/
if (SCB->VTOR < IFLASH_ADDR + BOARD_DFU_BOOT_SIZE) {
TRACE_INFO_WP("unknown\n\r");
} else {
TRACE_INFO_WP("DFU is the main application\n\r");
}
break;
case 1:
TRACE_INFO_WP("DFU switch requested by main application\n\r");
break;

1
firmware/apps/dfu/usb_strings.txt
View File

@@ -3,3 +3,4 @@ PRODUCT_STRING
DFU (Device Firmware Upgrade)
RAM
Flash (Application Partition)
Flash (Bootloader Partition)