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MIPS: SGI-IP22/28: Use PROM for memory detection

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EARLY_PRINTK uses ArcWrite (via prom_putchar) on IP22/28, which needs
to not mess up PROMs data structures. ARC PROM gives out a list of
memory chunks, which are used and which are free. This fixes the
problem of not working early printk.

By using XKPHYS spaces more than 256MB memory on Indigo2 R4k machines
is working now, too.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
This commit is contained in:
Thomas Bogendoerfer
2019-10-09 15:27:17 +02:00
committed by Paul Burton
parent 931e1bfea4
commit c0de00b286
5 changed files with 35 additions and 80 deletions
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1
arch/mips/include/asm/bootinfo.h
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@@ -99,6 +99,7 @@ extern void detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_ad
extern void prom_init(void);
extern void prom_free_prom_memory(void);
extern void prom_cleanup(void);
extern void free_init_pages(const char *what,
unsigned long begin, unsigned long end);