From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] printf and R9 in ARM architecture
Date: Tue, 20 Jan 2015 11:56:52 +0100 [thread overview]
Message-ID: <201501201156.52291.marex@denx.de> (raw)
In-Reply-To: <CAG3POBk3kjcqcE5-HF7xwFJfufrCnbvPuhLs9A=kiYC0SyEddA@mail.gmail.com>
On Tuesday, January 20, 2015 at 07:12:35 AM, Da Shi Cao wrote:
> In standalone applications, it seems that the execution of printf
> function in U-Boot is dependent on the value of register R9, which is
> setup in app_startup. But r9 can be used by your program at the
> decision of gcc compilation which is not aware of this dependence.
> This is especially the case if +O2 is used!
+CC the experts who probably broke it ;-)
Shouldn't you compile your standalone application with something like -ffixed-r9
?
Best regards,
Marek Vasut
prev parent reply other threads:[~2015-01-20 10:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-20 6:12 [U-Boot] printf and R9 in ARM architecture Da Shi Cao
2015-01-20 9:37 ` Albert ARIBAUD
2015-01-20 11:34 ` Da Shi Cao
2015-01-20 12:20 ` Albert ARIBAUD
2015-01-20 10:56 ` Marek Vasut [this message]
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