public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
From: Vipin Kumar <vipin.kumar@st.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] packed attribute problem
Date: Mon, 4 Oct 2010 15:08:29 +0530	[thread overview]
Message-ID: <4CA9A095.9000900@st.com> (raw)

Hi All,

I encountered a problem something like

struct xyz {
	int	x;
	int	y;
	int	z[CONST];
} __attribute__ ((packed));

struct xyz *abc;
u32 * status_reg = (u32 *)&abc->z[0];

writel(status, status_reg);

This writel results in writing byte by byte on the address pointed to by status_reg.
This problem is visible with both gcc version 4.4.1 as well as 4.5.0

Incidently, the same code works well with 4.2.4

The problem is visible in the usb host driver which uses the packed structures for 
accessing  device registers.

Regards
Vipin

             reply	other threads:[~2010-10-04  9:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-04  9:38 Vipin Kumar [this message]
2010-10-04 10:17 ` [U-Boot] packed attribute problem Wolfgang Denk
2010-10-04 10:30   ` Vipin Kumar
2010-10-04 10:44     ` Wolfgang Denk
2010-10-04 10:56       ` Reinhard Meyer
2010-10-04 11:01         ` Vipin Kumar
2010-10-04 11:46           ` Reinhard Meyer
2010-10-04 12:29             ` Wolfgang Denk
2010-10-04 12:43               ` Reinhard Meyer
2010-10-04 12:50                 ` Balau
2010-10-04 12:58                   ` Wolfgang Denk
2010-10-04 13:02                     ` [U-Boot] DDR SPD table sywang
2010-10-04 15:56                       ` Mike Frysinger
2010-10-04 12:56                 ` [U-Boot] packed attribute problem Wolfgang Denk
2010-10-05  3:45                 ` Vipin Kumar
2010-10-05 11:43                 ` Detlev Zundel
2010-10-05 18:03                   ` Scott Wood
2010-10-07  9:59                     ` Detlev Zundel
2010-10-07 16:46                       ` Scott Wood
2010-10-07 17:57                         ` Wolfgang Denk
2010-10-07 18:52                           ` Scott Wood
2010-10-07 19:31                             ` Wolfgang Denk
2010-10-07 20:15                               ` Scott Wood
2010-10-11 11:32                                 ` Detlev Zundel
2010-10-11 13:22                                   ` Balau
2010-10-04 10:57       ` Vipin Kumar
2010-10-04 12:04         ` 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=4CA9A095.9000900@st.com \
    --to=vipin.kumar@st.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