[U-Boot] [PATCH] net: fec: Avoid MX28 bus sync issue
Wolfgang Denk
wd at denx.de
Thu Sep 12 20:53:49 CEST 2013
Dear Fabio Estevam,
In message <CAOMZO5BY6kDOCoWn_SRwhPE7ssMjAReZ2bcFXGgFF-_Wrdgo0g at mail.gmail.com> you wrote:
>
> > It makes perfect sense to allocate variable with function scope only
> > on the stack. That's what the stack has been invented for.
>
> This buffer in the fec driver will be used in DMA transfer, so maybe
> that's the reason we should use malloc instead of using the stack?
What has DMA to do with that? We're talking about alignment only.
> At least in the kernel, we don't use stack for DMA buffers.
Yes, but them, the kernel uses a much more complicated memory setup,
with somewhat different mappings for different regions. We don't do
that - or do we? IMO we use a single mapping for the whole RAM ?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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