[BusyBox] ash : very slow response

[Glenn R.Heard Jr.]

Dinesh,
    Does the MIPS uart have a tx FIFO? This sounds to me the very same problem I had on 16550 UARTS with incorrect FIFO thresholds being set by the UART initialization routines.

Glenn Heard             rayzer at zoominternet.net
Software Engineer       gheard at altronicinc.com
Altronic Inc.           www.altronicinc.com
ICQ: 123194600          www.zoominternet.net/~rayzer
---
An idea is not responsible for the people who believe in it.

>
>Subject: RE: [BusyBox] ash : very slow response
>   From: Dinesh Nagpure <dinesh_nagpure at ivivity.com>
>   Date: Fri, 11 Oct 2002 08:56:36 -0400
>     To: busybox at busybox.net
>
>Hello again,
>
>I am still trying to resolve this problem. This time I am trying with
>Busybox v0.60.2 and linux kernel 2.4.16. 
>I did some further debugging, my findings are:
>For every key pressed I do get a RxData Ready interrupt, my interrupt
>handler gets called and reads the character properly. The handler then
>passes the character to the line discipline for processing (This still is a
>bit of gray area for me).
>Eventually the rs_write( ) function should get called which then transfers
>the character to the Tx buffer and enables the Transmit holding register
>empty interrupt. In my case this rs_write( ) gets called only after the
>twelth key press and then all the twelve characters are displayed at once.
>This is very consistent as if there is a threshold or buffer size set
>somewhere.
>Does anyone have any clue about what could be happening here? Any
>help/pointer will be greatly appreciated.
>
>Dinesh
>
>
>
>-----Original Message-----
>From: Dinesh Nagpure [mailto:dinesh_nagpure at ivivity.com]
>Sent: Wednesday, October 09, 2002 6:34 PM
>To: busybox at busybox.net
>Subject: [BusyBox] ash : very slow response
>
>
>Hello,
>
>I am trying to use BusyBox-0.60.4 on our MIPS (little endian) board running
>Linux kernel version 2.4.16. When init starts,
>The fist two messages appear quick and proper on the screen as:
>BusyBox v0.60.4 XXXXXXXXXXXXXXXXXXXXXXXXX Built-in shell (ash)
>enter 'help' for a list of built in commands
>
>But the third line appears mangled. (Which actually should be the string
>displayed by out2str( ) called from setjobctl( ) in ash.c)
>
>Then comes the prompt # .
>
>This point onwards the system becomes very slow. Unless I hit return key
>several times nothing would appear on the screen and then because of all
>those return keys screen would scroll. 
>
>I am using a simple inittab as below:
>::sysinit:/etc/init.d/rcS
>::respawn:/bin/sh
>
>My rcS does nothing but /bin/mount -a
>
>To me this appears to be some TTY setting issue but I am not sure how to go
>about it. The tty.c_cflag settings in function set_term( ) in file init.c
>appear reasonable. 
>
>Am I missing something here? Has anyone else faced similar problems in the
>past? any input will be appreciated.
>
>Thanks
>Dinesh
>iViVITY
>
>
>
>
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