diff options
| author | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-12-30 23:53:07 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2012-01-11 13:58:10 -0600 |
| commit | 3fd673cf363bc86ed42eff713d4e3506720e91a2 (patch) | |
| tree | 81c598c3b6e11409cf4f9b83d819e857ed95dbfe /board/sbc8548/law.c | |
| parent | af35be6ac962a737005737ab479da93cac2f596f (diff) | |
sbc8548: relocate 64MB user flash to sane boundary
The current situation has the 64MB user flash at an awkward
alignment; shifted back from 0xfc00_0000 by 8M, to leave an 8MB hole
for the soldered on boot flash @ EOM. But to switch to optionally
supporting booting off the 64MB flash, the 64MB will then be mapped
at the sane address of 0xfc00_0000.
This leads to awkward things when programming the 64MB flash prior
to transitioning to it -- i.e. even though the chip spans from
0xfb80_0000 to 0xff7f_ffff, you would have to program a u-boot image
into the two sectors from 0xfbf0_0000 --> 0xfbff_ffff so that it was
in the right place when JP12/SW2.8 were switched to make the 64MB on
/CS0. (i.e. the chip is only looking at the bits in mask 0x3ff_ffff)
We also have to have three TLB entries responsible for dealing with
mapping the 64MB flash due to this 8MB of misalignment.
In the end, there is address space from 0xec00_0000 to 0xefff_ffff
where we can map it, and then the transition from booting from one
config to the other will be a simple 0xec --> 0xfc mapping. Plus we
can toss out a TLB entry.
Note that TLB0 is kept at 64MB and not shrunk down to the 8MB boot
flash; this means we won't have to change it when the alternate
config uses the full 64MB for booting, in TLB0.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'board/sbc8548/law.c')
| -rw-r--r-- | board/sbc8548/law.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/board/sbc8548/law.c b/board/sbc8548/law.c index 5fa9db02f5..febb6829c3 100644 --- a/board/sbc8548/law.c +++ b/board/sbc8548/law.c @@ -36,9 +36,9 @@ * 0xe000_0000 0xe000_ffff CCSR 1M * 0xe200_0000 0xe27f_ffff PCI1 IO 8M * 0xe280_0000 0xe2ff_ffff PCIe IO 8M + * 0xec00_0000 0xefff_ffff FLASH (2nd bank) 64M * 0xf000_0000 0xf7ff_ffff SDRAM 128M * 0xf8b0_0000 0xf80f_ffff EEPROM 1M - * 0xfb80_0000 0xff7f_ffff FLASH (2nd bank) 64M * 0xff80_0000 0xffff_ffff FLASH (boot bank) 8M * * Notes: @@ -47,6 +47,7 @@ */ struct law_entry law_table[] = { + SET_LAW(CONFIG_SYS_ALT_FLASH, LAW_SIZE_64M, LAW_TRGT_IF_LBC), #ifndef CONFIG_SPD_EEPROM SET_LAW(CONFIG_SYS_DDR_SDRAM_BASE, LAW_SIZE_256M, LAW_TRGT_IF_DDR), #endif |