From: 腾飞龙 <jinlongwei@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] How is the "ba 0xfff80000" located at 0xfffffffc ?
Date: Wed, 28 Dec 2005 17:33:48 +0800 [thread overview]
Message-ID: <c002eb610512280133q562c8e91w@mail.gmail.com> (raw)
As in Embedded Planet EP405 board, ppc405GPr processor support
high boot only, when Power On or reset, the processor starts at
0xfffffffc and the code is executed from flash/rom. There is usually a
branch instruction(such as: ba target) in 0xfffffffc so that it can
jump to the target. For example, if i set TEXT_BASE=0xfff80000 in
u-boot,it means the instruction "ba 0xfff80000" is in 0xfffffffc. My
questions are follow:
1 where can i find the branch instruction "ba 0xfff80000" in
u-boot-1.1.3 code? it seems it is not in start.s
2 As we know, before u-boot is written to flash the first time,
there is nothing in flash. when we write u-boot in flash from addr
0xfff80000, how is the branch instruction written to addr 0xfffffffc
which is not neigbour to u-boot code body?
Thank you and best wishes!
next reply other threads:[~2005-12-28 9:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-28 9:33 腾飞龙 [this message]
2005-12-28 10:06 ` [U-Boot-Users] How is the "ba 0xfff80000" located at 0xfffffffc ? 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=c002eb610512280133q562c8e91w@mail.gmail.com \
--to=jinlongwei@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