From: Timur Tabi <timur@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] Why are some global vars part of the image, and some not?
Date: Mon, 06 Nov 2006 12:08:48 -0600 [thread overview]
Message-ID: <454F7A30.9030100@freescale.com> (raw)
In-Reply-To: <454F78D6.6020805@smiths-aerospace.com>
Jerry Van Baren wrote:
> You don't understand, u-boot _is_ what zeros bss so, until u-boot is
> running enough to zero bss, bss will be random garbage.
If BSS were merged into the DATA segment, then the compiler would be the one
that zeros BSS. Basically, BSS would go away, and all global variables
(static or otherwise) would be placed into DATA. They would be initialized to
zeros by the compiler, and when the image is burned into flash, that image
would have zeros in those memory locations.
This would also allow us to delete the BSS-initialization code in U-Boot.
I'm not advocating that we should implement this idea. I just wanted to
clarify things.
--
Timur Tabi
Linux Kernel Developer @ Freescale
next prev parent reply other threads:[~2006-11-06 18:08 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-03 21:58 [U-Boot-Users] Why are some global vars part of the image, and some not? Timur Tabi
2006-11-03 22:19 ` Timur Tabi
2006-11-03 23:47 ` Wolfgang Denk
2006-11-04 0:09 ` Timur Tabi
2006-11-04 0:33 ` Wolfgang Denk
2006-11-03 23:44 ` Wolfgang Denk
2006-11-04 0:07 ` Timur Tabi
2006-11-04 0:31 ` Wolfgang Denk
2006-11-04 1:38 ` Timur Tabi
2006-11-04 2:04 ` Wolfgang Denk
2006-11-06 17:43 ` Scott Wood
2006-11-06 18:03 ` Jerry Van Baren
2006-11-06 18:08 ` Timur Tabi [this message]
2006-11-06 18:48 ` Jerry Van Baren
2006-11-06 18:56 ` Scott Wood
2006-11-06 19:06 ` Jerry Van Baren
2006-11-06 19:46 ` Scott Wood
2006-11-06 19:54 ` Timur Tabi
2006-11-06 20:13 ` Jerry Van Baren
2006-11-06 20:21 ` Timur Tabi
2006-11-06 20:44 ` Wolfgang Denk
2006-11-06 20:35 ` Tolunay Orkun
2006-11-06 20:29 ` Wolfgang Denk
2006-11-06 20:26 ` Wolfgang Denk
2006-11-06 20:48 ` Scott Wood
2006-11-06 21:15 ` Wolfgang Denk
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