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tools: kwboot: Make kwboot more robust on a38x

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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 <jon@solid-run.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Jon Nettleton 2018-08-13 18:24:38 +03:00 committed by Stefan Roese
parent 881e8478c1
commit 9ca6fae9d0
1 changed files with 10 additions and 4 deletions
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14
tools/kwboot.c
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@ -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;