carl9170 firmware: cleanup dma memory before reset

While the documentation does not mention anything
in this regard. There's clearly some bootloader
action in the DMA memory region.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>

diff --git a/carlfw/usb/main.c b/carlfw/usb/main.c
index fac37805be7f555a90f5ef128e258932bf1fee5e..6545ec0931180e709936c264afb8394d4ed52a14 100644 (file)
--- a/carlfw/usb/main.c
+++ b/carlfw/usb/main.c
@@ -284,6 +284,9 @@ void __noreturn reboot(void)
        /* Turn off power */
        turn_power_off();
 
+       /* clean bootloader workspace */
+       memset(&dma_mem, 0, sizeof(dma_mem));
+
        /* add by ygwei for work around USB PHY chirp sequence problem */
        set(0x10f100, 0x12345678);