On Wed, 30 May 2007 21:36:41 -0700 "Yinghai Lu" <[email protected]> wrote:
> On 5/30/07, Yinghai Lu <[email protected]> wrote:
> > On 5/30/07, Andrew Morton <[email protected]> wrote:
> > > On Tue, 29 May 2007 18:43:59 -0700 Yinghai Lu <[email protected]> wrote:
> > >
> > > > [PATCH 4/5] serial: convert early_uart to earlycon for 8250
> > >
> > > drivers/serial/8250_early.c: In function 'parse_options':
> > > drivers/serial/8250_early.c:143: error: 'FIX_EARLYCON_MEM_BASE' undeclared (first use in this function)
> > > drivers/serial/8250_early.c:143: error: (Each undeclared identifier is reported only once
> > >
> > > That was with http://userweb.kernel.org/~akpm/config-sony.txt, but this is
> > > going to break a whole pile of architectures (alpha, powerpc, others).
> >
> > alpha, powerpc, others may need sth like ia64, if they do not support fixmap.
> >
> >
>
> or create dummy fixmap.h that doesn't support fixmap.
>
You could require that the architecture implement some specific function
for mapping the early-uart. Say,
void __iomem *map_early_uart(unsigned long phys_addr, unsigned long len);
void unmap_early_uart(void * __iomem *addr);
then, in drivers/serial/8250_early.c, do
void __iomem * __attribute__((weak))
map_early_uart(unsigned long phys_addr, unsigned long len)
{
return ioremap(phys_addr, len);
}
void __attribute__((weak)) unmap_early_uart(void * __iomem *addr)
{
iounmap(addr);
}
and in arch/i386/mm/ioremap.c
#ifdef CONFIG_something
void __iomem *map_early_uart(unsigned long phys_addr, unsigned long len)
{
void __iomem * vaddr;
set_fixmap_nocache(idx, phys & PAGE_MASK);
vaddr = (void __iomem *)__fix_to_virt(idx);
vaddr += phys & ~PAGE_MASK;
return vaddr;
}
void unmap_early_uart(void * __iomem *addr)
{
/* nothing to do */
}
#endif
or such.
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