From 3fd673cf363bc86ed42eff713d4e3506720e91a2 Mon Sep 17 00:00:00 2001 From: Paul Gortmaker Date: Fri, 30 Dec 2011 23:53:07 -0500 Subject: 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 Signed-off-by: Kumar Gala --- board/sbc8548/law.c | 3 ++- board/sbc8548/tlb.c | 23 ++++++++--------------- 2 files changed, 10 insertions(+), 16 deletions(-) (limited to 'board/sbc8548') diff --git a/board/sbc8548/law.c b/board/sbc8548/law.c index 5fa9db0..febb682 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 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), }; -- cgit v1.1