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| 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/tlb.c | |
| parent | af35be6ac962a737005737ab479da93cac2f596f (diff) | |
| download | u-boot-imx-3fd673cf363bc86ed42eff713d4e3506720e91a2.zip u-boot-imx-3fd673cf363bc86ed42eff713d4e3506720e91a2.tar.gz u-boot-imx-3fd673cf363bc86ed42eff713d4e3506720e91a2.tar.bz2 | |
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/tlb.c')
| -rw-r--r-- | board/sbc8548/tlb.c | 23 |
1 files changed, 8 insertions, 15 deletions
diff --git a/board/sbc8548/tlb.c b/board/sbc8548/tlb.c index bb4c052..e9cedc7 100644 --- a/board/sbc8548/tlb.c +++ b/board/sbc8548/tlb.c @@ -46,12 +46,14 @@ struct fsl_e_tlb_entry tlb_table[] = { /* * TLB 0: 64M Non-cacheable, guarded - * 0xfc000000 56M 8MB -> 64MB of user flash + * 0xfc000000 56M unused * 0xff800000 8M boot FLASH + * .... or .... + * 0xfc000000 64M user flash + * * Out of reset this entry is only 4K. */ - SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH + 0x800000, - CONFIG_SYS_ALT_FLASH + 0x800000, + SET_TLB_ENTRY(1, 0xfc000000, 0xfc000000, MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G, 0, 0, BOOKE_PAGESZ_64M, 1), @@ -103,21 +105,12 @@ struct fsl_e_tlb_entry tlb_table[] = { 0, 5, BOOKE_PAGESZ_16M, 1), /* - * TLB 6: 4M Non-cacheable, guarded - * 0xfb800000 4M 1st 4MB block of 64MB user FLASH + * TLB 6: 64M Non-cacheable, guarded + * 0xec000000 64M 64MB user FLASH */ SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH, CONFIG_SYS_ALT_FLASH, MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G, - 0, 6, BOOKE_PAGESZ_4M, 1), - - /* - * TLB 7: 4M Non-cacheable, guarded - * 0xfbc00000 4M 2nd 4MB block of 64MB user FLASH - */ - SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH + 0x400000, - CONFIG_SYS_ALT_FLASH + 0x400000, - MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G, - 0, 7, BOOKE_PAGESZ_4M, 1), + 0, 6, BOOKE_PAGESZ_64M, 1), }; |