public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
From: Angelo Dureghello <sysamfw@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] common/xyzmodem.c, ymodem, slow behavior receiving bytes
Date: Fri, 23 Nov 2012 23:57:22 +0100	[thread overview]
Message-ID: <20121123225721.GA28751@angel3> (raw)
In-Reply-To: <20121119225824.2144420078E@gemini.denx.de>

Dear all,

i have found out that this issue was also and probably mainly caused 
from the issue fixed in my last patch posted:

http://patchwork.ozlabs.org/patch/201421/

All serial driver routines (for mcfuart.c in my case) was executed
from the flash memory, even after monitor relocation to ram.

Considering flash memory access time (10 wait states set in my case), 
this was causing code execution speed to be dramatically slow, near the 
limit for receiving at 115200 uart speed.

Enabling cache for the sdram fasted up a bit the operations and solved 
the issue, but main problem here was certainly the execution from flash.

Best Regards
Angelo Dureghello

  parent reply	other threads:[~2012-11-23 22:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-10 13:40 [U-Boot] common/xyzmodem.c, ymodem, slow behavior receiving bytes Angelo Dureghello
2012-11-13  0:16 ` Angelo Dureghello
2012-11-13  1:41   ` Marek Vasut
2012-11-13  7:09   ` Wolfgang Denk
2012-11-14  9:47     ` Angelo Dureghello
2012-11-14 10:28       ` Henrik Nordström
2012-11-14 11:05       ` Wolfgang Denk
2012-11-19 21:54         ` Angelo Dureghello
2012-11-19 22:58           ` Wolfgang Denk
2012-11-22 14:38             ` Angelo Dureghello
2012-11-23 22:57             ` Angelo Dureghello [this message]
2012-11-23 23:04               ` Wolfgang Denk

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20121123225721.GA28751@angel3 \
    --to=sysamfw@gmail.com \
    --cc=u-boot@lists.denx.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox