Random delay between bytes in UART driver #38
Description
Tested in Kernel >= 3.8.13-boneXX and all debian 7.4, 7.8, 8.0, 8.1
The ACR122L Contactless Card Reader is crashing due random delay/jitter in synchronous UART writes.
Howto reproduce the bug:
int fd=open("/dev/ttyO2",......);
buffer[100];
memset(buffer,0xff,sizeof(buffer));
write(fd,buffer,sizeof(buffer));
The write must be atomic, but in oscilloscope is clear to see large random delay between bytes.
Large random delay means several milliseconds.
This bug is not present Angstrom Distribution (BeagleBone Black - 2GB eMMC) 2013-09-04.