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sbc8548: relocate 64MB user flash to sane boundary

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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>
This commit is contained in:
Paul Gortmaker 2011-12-30 23:53:07 -05:00 committed by Kumar Gala
parent af35be6ac9
commit 3fd673cf36
4 changed files with 22 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
board/sbc8548/law.c
View File

@ -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

23
board/sbc8548/tlb.c
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@ -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),
};

8
doc/README.sbc8548
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@ -100,6 +100,9 @@ Boot flash:
Sodimm flash:
intel V28F128Jx, 16384x8 (4 devices) at 0xfb80_0000
Note that this address reflects the default setting for
the JTAG debugging tools, but since the alignment is
rather inconvenient, u-boot puts it at 0xec00_0000.
Jumpers:
@ -187,9 +190,12 @@ start end CS<n> width Desc.
0000_0000 0fff_ffff MCS0,1 64 DDR2 (256MB)
f000_0000 f7ff_ffff CS3,4 32 LB SDRAM (128MB)
f800_0000 f8b0_1fff CS5 - EPLD
fb80_0000 ff7f_ffff CS6 32 SODIMM flash (64MB)
fb80_0000 ff7f_ffff CS6 32 SODIMM flash (64MB) [*]
ff80_0000 ffff_ffff CS0 8 Boot flash (8MB)
[*] fb80 represents the default programmed by WR JTAG register files,
but u-boot places the flash at either ec00 or fc00 based on JP12.
The EPLD on CS5 demuxes the following devices at the following offsets:
offset size width device

10
include/configs/sbc8548.h
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@ -140,7 +140,7 @@
* FLASH on the Local Bus
* Two banks, one 8MB the other 64MB, using the CFI driver.
* Boot from BR0/OR0 bank at 0xff80_0000
* Alternate BR6/OR6 bank at 0xfb80_0000
* Alternate BR6/OR6 bank at 0xec00_0000
*
* BR0:
* Base address 0 = 0xff80_0000 = BR0[0:16] = 1111 1111 1000 0000 0
@ -152,13 +152,13 @@
* 1111 1111 1000 0000 0000 1000 0000 0001 = ff800801 BR0
*
* BR6:
* Base address 6 = 0xfb80_0000 = BR6[0:16] = 1111 1011 1000 0000 0
* Base address 6 = 0xec00_0000 = BR6[0:16] = 1110 1100 0000 0000 0
* Port Size = 32 bits = BRx[19:20] = 11
* Use GPCM = BRx[24:26] = 000
* Valid = BRx[31] = 1
*
* 0 4 8 12 16 20 24 28
* 1111 1011 1000 0000 0001 1000 0000 0001 = fb801801 BR6
* 1110 1100 0000 0000 0001 1000 0000 0001 = ec001801 BR6
*
* OR0:
* Addr Mask = 8M = OR1[0:16] = 1111 1111 1000 0000 0
@ -186,11 +186,11 @@
*/
#define CONFIG_SYS_BOOT_BLOCK 0xff800000 /* start of 8MB Flash */
#define CONFIG_SYS_ALT_FLASH 0xfb800000 /* 64MB "user" flash */
#define CONFIG_SYS_ALT_FLASH 0xec000000 /* 64MB "user" flash */
#define CONFIG_SYS_FLASH_BASE CONFIG_SYS_BOOT_BLOCK /* start of FLASH 16M */
#define CONFIG_SYS_BR0_PRELIM 0xff800801
#define CONFIG_SYS_BR6_PRELIM 0xfb801801
#define CONFIG_SYS_BR6_PRELIM 0xec001801
#define CONFIG_SYS_OR0_PRELIM 0xff806e65
#define CONFIG_SYS_OR6_PRELIM 0xfc006e65