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[v2,0/2] android: colibri_imx7: reserve DDR memory for Cortex-M4

Message ID 20191203120447.24820-1-igor.opaniuk@gmail.com
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Series android: colibri_imx7: reserve DDR memory for Cortex-M4 | expand

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Igor Opaniuk Dec. 3, 2019, 12:04 p.m. UTC 
i.MX 7's Cortex-M4 core can run from DDR and uses DDR memory for
the rpmsg communication. Both use cases need a fixed location of
memory reserved. For the rpmsg use case the reserved area needs
to be in sync with the kernel's hardcoded vring descriptor location.

Introduce support for adding linux,usable-memory property to carve
out 1MB of memory in case the M4 core is running. Also make sure
that the i.MX 7 specific rpmsg driver does not get loaded in case
we do not carve out memory.

v2:
- fixed build where CONFIG_ARCH_FIXUP_FDT_MEMORY is not set.

Igor Opaniuk (2):
  common: fdt_support: add support for setting usable memory
  board: colibri_imx7: reserve DDR memory for Cortex-M4

 arch/arm/include/asm/mach-imx/sys_proto.h |  2 ++
 board/toradex/colibri_imx7/colibri_imx7.c | 37 +++++++++++++++++++++++
 common/fdt_support.c                      | 35 +++++++++++++++++++++
 include/fdt_support.h                     |  1 +
 4 files changed, 75 insertions(+)