From: Alexander Holler <holler@ahsoftware.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] arm: wrong Relocation and not cleared BSS
Date: Sat, 30 Oct 2010 16:07:13 +0200 [thread overview]
Message-ID: <4CCC2691.4070903@ahsoftware.de> (raw)
In-Reply-To: <4CCC242C.8070303@free.fr>
Am 30.10.2010 15:57, schrieb Albert ARIBAUD:
> Le 30/10/2010 15:45, Alexander Holler a ?crit :
>> If the code in u-boot would not assume that bss is zero, I don't
>> understand why clear_bss in start.S exists.
>
> As I said, out of courtesy.
>
> Still, BSS zeroing does not seem to relate to what you witness. You're
> not reading a variable that you think should be zero; you're writing
> then reading a BSS variable, and find that you read something different
> from what you read.
I'm not doing anything. Thats just what I've cloncluded reading existing
code. First, clear_bss exists, Second, code in u-boot seems to assume
that bss is cleared.
I've run into this problem because the following check in
nand_set_defaults() in nand_base.c:
-------------
/* check, if a user supplied command function given */
if (chip->cmdfunc == NULL)
chip->cmdfunc = nand_command;
-------------
But the board-specific function which presets those values doesn't touch
chip->cmdfunc (kirkwood_nand.c):
------------------
int board_nand_init(struct nand_chip *nand)
{
nand->options = NAND_COPYBACK | NAND_CACHEPRG |
NAND_NO_PADDING;
nand->ecc.mode = NAND_ECC_SOFT;
nand->cmd_ctrl = kw_nand_hwcontrol;
nand->chip_delay = 30;
nand->select_chip = kw_nand_select_chip;
return 0;
}
------------------
And nothing else touches those nand_chip structures before they are used.
Regards,
Alexander
next prev parent reply other threads:[~2010-10-30 14:07 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-30 13:08 [U-Boot] arm: wrong Relocation and not cleared BSS Alexander Holler
2010-10-30 13:36 ` Albert ARIBAUD
2010-10-30 13:45 ` Alexander Holler
2010-10-30 13:57 ` Albert ARIBAUD
2010-10-30 14:07 ` Alexander Holler [this message]
2010-10-30 14:39 ` Wolfgang Denk
2010-10-30 16:01 ` Albert ARIBAUD
2010-10-30 16:10 ` Wolfgang Denk
2010-10-30 14:37 ` Wolfgang Denk
2010-10-30 14:36 ` Wolfgang Denk
2010-10-31 10:59 ` Alexander Holler
2010-10-31 11:58 ` Wolfgang Denk
2010-10-31 12:21 ` Albert ARIBAUD
2010-10-31 16:18 ` Alexander Holler
2010-10-30 15:00 ` Wolfgang Denk
2010-10-30 17:21 ` Albert ARIBAUD
2010-10-30 18:01 ` Wolfgang Denk
2010-10-31 7:44 ` Heiko Schocher
2010-10-30 15:15 ` Darius Augulis
2010-10-30 16:44 ` Albert ARIBAUD
2010-10-30 20:03 ` Alexander Holler
2010-10-30 20:51 ` Alexander Holler
2010-10-31 7:47 ` Heiko Schocher
2010-11-02 5:39 ` V, Aneesh
2010-11-02 5:58 ` V, Aneesh
2010-11-02 6:32 ` Albert ARIBAUD
2010-11-02 7:18 ` V, Aneesh
2010-11-02 7:37 ` [U-Boot] Bad page state in process 'swapper' sywang
2010-11-02 7:44 ` Albert ARIBAUD
2010-11-02 8:13 ` sywang
2010-11-02 8:44 ` Wolfgang Denk
2010-11-02 8:40 ` Wolfgang Denk
2010-11-03 2:29 ` sywang
2010-11-02 7:41 ` [U-Boot] arm: wrong Relocation and not cleared BSS Albert ARIBAUD
2010-11-02 8:53 ` V, Aneesh
2010-11-02 9:04 ` Albert ARIBAUD
2010-10-31 7:43 ` Heiko Schocher
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