On Thu, May 16, 2019 at 05:19:13PM +0800, Weijie Gao wrote:
The initr_watchdog is currently placed before initr_serial. The initr_watchdog calls printf and printf finally calls ops->putc of a serial driver.
However, gd->cur_serial_dev points to a udevice allocated in board_f. The gd->cur_serial_dev->driver->ops->putc points the the code region before relocation.
Some serial drivers call WATCHDOG_RESET() in ops->putc. When DM is enabled for watchdog, watchdog_reset() is called. watchdog_reset() calls get_timer to get current timer.
On some platforms the timer driver is also a DM driver. initr_watchdog is placed right after initr_dm, which means the timer driver hasn't been initialized. So dm_timer_init() is called. To create a new udevice, calloc is called.
However start from ops->putc, u-boot execution flow is redirected into the memory region before relocation (board_f). In board_f, dlmalloc hasn't been initialized. The call to calloc will fail, and this will cause DM to print out an error message, and it will call printf again, causing recursive error outputs.
This patch places initr_watchdog after initr_serial to solve this issue.
Cc: Stefan Roese sr@denx.de Reviewed-by: Ryder Lee ryder.lee@mediatek.com Signed-off-by: Weijie Gao weijie.gao@mediatek.com Reviewed-by: Stefan Roese sr@denx.de Tested-by: Frank Wunderlich frank-w@public-files.de Tested-by: Suniel Mahesh sunil.m@techveda.org
Applied to u-boot/master, thanks!