[PATCH 1/4] ARM: ep93xx: switch to SPARSEMEM
From: hsweeten@visionengravers.com (H Hartley Sweeten)
Date: 2017-02-21 18:15:26
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
The EP93xx has four chip selects that can be used for the SDRAM memory. These chip selects are decoded to specify an address domain: SDCS3 0x00000000-0x0fffffff with Boot Option ASDO=1 SDCS0 0xc0000000-0xcfffffff SDCS1 0xd0000000-0xdfffffff SDCS2 0xe0000000-x0efffffff SDCS3 0xf0000000-0xffffffff with Boot Option ASDO=0 Because of the row/column/bank architecture of SDRAM, the mapping of these memories into the processor's memory space is discontiguous. Most ep93xx systems only use one of the chip selects. For these systems, ARCH_HAS_HOLES_MEMORYMODEL has worked fine to handle the discontiguous memory. But, some of the TS-72xx boards use multiple chip selects. The TS-7300 in particular uses SDCS3 (with ASDO=1) and SDCS2. On that system with ARCH_HAS_HOLES_MEMORYMODEL the SDCS2 memory does not get handled correctly and results in the system not booting. Change the EP93xx to ARCH_SPARSEMEM_ENABLE. This handles the discontiguous memory for all configurations. This has been tested on the following ep93xx platforms: EDB9307A with 64 MiB on SDCS0 Vision EP9307 with 64 MiB on SDCS0 TS-7300 with 64 MiB on SDCS3 (with ASDO=1) and 64 MiB on SDCS2 sim.one with 64 MiB on SDCS0 Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Tested-by: Linus Walleij <redacted> Cc: Russell King <linux@armlinux.org.uk> --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 71cea9e..cc8a88f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig@@ -383,7 +383,7 @@ config ARCH_EBSA110 config ARCH_EP93XX bool "EP93xx-based" - select ARCH_HAS_HOLES_MEMORYMODEL + select ARCH_SPARSEMEM_ENABLE select ARM_AMBA select ARM_PATCH_PHYS_VIRT select ARM_VIC
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2.10.0