diff options
| author | Becky Bruce <becky.bruce@freescale.com> | 2008-11-06 17:37:35 -0600 |
|---|---|---|
| committer | Jon Loeliger <jdl@freescale.com> | 2008-11-10 10:10:05 -0600 |
| commit | 3111d32c494e8251b90917447796a7206b757e1e (patch) | |
| tree | 774785cc25baf8f118d2539e1d353d3ffd76afd7 /doc | |
| parent | c759a01a0022de9378a3a761f49786f87684c916 (diff) | |
| download | blackbird-obmc-uboot-3111d32c494e8251b90917447796a7206b757e1e.tar.gz blackbird-obmc-uboot-3111d32c494e8251b90917447796a7206b757e1e.zip | |
mpc8641: Support 36-bit physical addressing
This patch creates a memory map with all the devices
in 36-bit physical space, in addition to the 32-bit map.
The CCSR relocation is moved (again, sorry) to
allow for the physical address to be 36 bits - this
requires translation to be enabled. With 36-bit physical
addressing enabled, we are no longer running with VA=PA
translations. This means we have to distinguish between
the two in the config file. The existing region name is
used to indicate the virtual address, and a _PHYS variety
is created to represent the physical address.
Large physical addressing is not enabled by default.
Set CONFIG_PHYS_64BIT in the config file to turn this on.
Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.mpc8641hpcn | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/doc/README.mpc8641hpcn b/doc/README.mpc8641hpcn index 0a6e715bc2..5ac39e6782 100644 --- a/doc/README.mpc8641hpcn +++ b/doc/README.mpc8641hpcn @@ -113,6 +113,9 @@ To Flash U-boot into the alternative bank (0xEF800000 - 0xEFBFFFFF): ------------- NOTE: RIO and PCI are mutually exclusive, so they share an address +For 32-bit u-boot, devices are mapped so that the virtual address == +the physical address, and the map looks liks this: + Memory Range Device Size ------------ ------ ---- 0x0000_0000 0x7fff_ffff DDR 2G @@ -127,6 +130,27 @@ NOTE: RIO and PCI are mutually exclusive, so they share an address 0xffc1_0000 0xffc1_ffff PCI2/PEX2 IO 64K 0xef80_0000 0xefff_ffff Flash 8M +For 36-bit-enabled u-boot, the virtual map is the same as for 32-bit. +However, the physical map is altered to reside in 36-bit space, as follows. +Addresses are no longer mapped with VA == PA. All accesses from +software use the VA; the PA is only used for setting up windows +and mappings. Note that the low 32 bits are the same as the VA above; +only the top 4 bits vary: + + Memory Range Device Size + ------------ ------ ---- + 0x0_0000_0000 0x0_7fff_ffff DDR 2G + 0xc_8000_0000 0xc_9fff_ffff RIO MEM 512M + 0xc_8000_0000 0xc_9fff_ffff PCI1/PEX1 MEM 512M + 0xc_a000_0000 0xc_bfff_ffff PCI2/PEX2 MEM 512M + 0xf_ffe0_0000 0xf_ffef_ffff CCSR 1M + 0xf_ffdf_0000 0xf_ffdf_7fff PIXIS 8K + 0xf_ffdf_8000 0xf_ffdf_ffff CF 8K + 0x0_f840_0000 0xf_f840_3fff Stack space 32K + 0xf_ffc0_0000 0xf_ffc0_ffff PCI1/PEX1 IO 64K + 0xf_ffc1_0000 0xf_ffc1_ffff PCI2/PEX2 IO 64K + 0xf_ef80_0000 0xf_efff_ffff Flash 8M + 5. pixis_reset command -------------------- A new command, "pixis_reset", is introduced to reset mpc8641hpcn board |
