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u-boot/board/freescale/ls2085a
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Bhupesh Sharma a2dc818f21 armv8/ls2085a: Expose all DDR region(s) to Linux 
This patch allows u-boot to expose the complete DDR region(s) to Linux
(after subtracting the memory hidden via MEM_TOP_HIDE mechanism).

This allows the u-boot to support the 48-bit VA support provided by
ARM64 Linux in flavors 3.18 and above, by passing the appropriate
'memory' DTS nodes.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma at freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar at freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
2015-07-20 11:44:35 -07:00
..
ddr.c ARMv8/LS2085A: Enable auto precharge for DP-DDR 2015-02-24 13:09:22 -08:00
ddr.h ARMv8/ls2085a_emu: Enable DP-DDR as standalone memory block 2014-09-25 08:36:18 -07:00
Kconfig kconfig: armv8: move CONFIG_ARM64 to Kconfig 2014-09-16 12:24:00 -04:00
ls2085a.c armv8/ls2085a: Expose all DDR region(s) to Linux 2015-07-20 11:44:35 -07:00
MAINTAINERS Add board MAINTAINERS files 2014-07-30 08:48:06 -04:00
Makefile ARMv8/ls2085a_emu: Add LS2085A emulator and simulator board support 2014-07-04 19:48:41 +02:00
README armv8/ls2085a: Expose all DDR region(s) to Linux 2015-07-20 11:44:35 -07:00

README 

Freescale ls2085a_emu

This is a emulator target with limited peripherals.

Memory map from core's view

0x00_0000_0000 .. 0x00_000F_FFFF	Boot Rom
0x00_0100_0000 .. 0x00_0FFF_FFFF	CCSR
0x00_1800_0000 .. 0x00_181F_FFFF	OCRAM
0x00_3000_0000 .. 0x00_3FFF_FFFF	IFC region #1
0x00_8000_0000 .. 0x00_FFFF_FFFF	DDR region #1
0x05_1000_0000 .. 0x05_FFFF_FFFF	IFC region #2
0x80_8000_0000 .. 0xFF_FFFF_FFFF	DDR region #2

Other addresses are either reserved, or not used directly by u-boot.
This list should be updated when more addresses are used.

Booting Linux flavors which do not support 48-bit VA (< Linux 3.18)
-------------------------------------------------------------------
One needs to use appropriate bootargs to boot Linux flavors which do
not support 48-bit VA (for e.g. < Linux 3.18) by appending mem=2048M, as shown
below:

=> setenv bootargs 'console=ttyS1,115200 root=/dev/ram
   earlycon=uart8250,mmio,0x21c0600,115200 default_hugepagesz=2m hugepagesz=2m
   hugepages=16 mem=2048M'