From 9ca6fae9d0588bccba681c4f7ab1926bc32bdbcc Mon Sep 17 00:00:00 2001 From: Jon Nettleton Date: Mon, 13 Aug 2018 18:24:38 +0300 Subject: [PATCH] tools: kwboot: Make kwboot more robust on a38x This patch accomplishes 2 things to make the kwboot procedure on the a38x more reliable. 1) We fill the tty with 1K of the magic bootparam. This helps with the timing of where the microcode picks up in the read of the line to ensure we actually catch the break to go into recovery mode 2) Before starting the xmodem transfer we sleep for 2 seconds and then flush the line. This allows all the magic bootparam to be flushed from the line and makes the xmodem transfer reliable and removes the Bad message failures. Signed-off-by: Jon Nettleton Signed-off-by: Baruch Siach Reviewed-by: Chris Packham Signed-off-by: Stefan Roese --- tools/kwboot.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/tools/kwboot.c b/tools/kwboot.c index 50ae2b4..4be094c 100644 --- a/tools/kwboot.c +++ b/tools/kwboot.c @@ -286,6 +286,7 @@ kwboot_bootmsg(int tty, void *msg) { int rc; char c; + int count; if (msg == NULL) kwboot_printv("Please reboot the target into UART boot mode..."); @@ -297,10 +298,12 @@ kwboot_bootmsg(int tty, void *msg) if (rc) break; - rc = kwboot_tty_send(tty, msg, 8); - if (rc) { - usleep(msg_req_delay * 1000); - continue; + for (count = 0; count < 128; count++) { + rc = kwboot_tty_send(tty, msg, 8); + if (rc) { + usleep(msg_req_delay * 1000); + continue; + } } rc = kwboot_tty_recv(tty, &c, 1, msg_rsp_timeo); @@ -426,6 +429,9 @@ kwboot_xmodem(int tty, const void *_data, size_t size) kwboot_printv("Sending boot image...\n"); + sleep(2); /* flush isn't effective without it */ + tcflush(tty, TCIOFLUSH); + do { struct kwboot_block block; int n;