It's observed that the bootmenu on a serial console sometimes incorrectly quitted with superfluous characters filled to command line input:
*** U-Boot Boot Menu ***
1. Startup system (Default) 2. Upgrade firmware 3. Upgrade ATF BL2 4. Upgrade ATF FIP 5. Load image 0. U-Boot consolePress UP/DOWN to move, ENTER to select, ESC to quit MT7988> [B
Analysis shows it was caused by the wrong logic of bootmenu_loop:
At first the bootmenu_loop received the first ESC char correctly.
However, during the second call to bootmenu_loop, there's no data in the UART Rx FIFO. Due to the low baudrate, the second char of the down array key sequence hasn't be fully received.
But bootmenu_loop just did a mdelay(10), and then treated it as a single ESC key press event. It didn't even try tstc() again after the 10ms timeout.
This patch fixes this issue by letting bootmenu_loop check tstc() twice.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- common/menu.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/common/menu.c b/common/menu.c index 5fd705039fc..bd2ac3e0ed9 100644 --- a/common/menu.c +++ b/common/menu.c @@ -566,7 +566,7 @@ enum bootmenu_key bootmenu_loop(struct bootmenu_data *menu, struct cli_ch_state *cch) { enum bootmenu_key key; - int c; + int c, errchar = 0; int choice;
c = cli_ch_process(cch, 0); @@ -574,7 +574,8 @@ enum bootmenu_key bootmenu_loop(struct bootmenu_data *menu, while (!c && !tstc()) { schedule(); mdelay(10); - c = cli_ch_process(cch, -ETIMEDOUT); + c = cli_ch_process(cch, errchar); + errchar = -ETIMEDOUT; } if (!c) { c = getchar();