sbc8548: reclaim wasted sector in boot flash

By nature of being based off the MPC8548CDS board, this
board inherited an ENV_SIZE setting of 256k.  But since
it has a smaller flash device (8MB soldered on), it has
a native sector size of 128k, and hence the ENV_SIZE was
causing 2 sectors to be used for the environment.

By removing the unused sector, we can push TEXT_BASE up
closer to the end of address space and reclaim that
sector for any other application.  This also fixes the
mismatch between TEXT_BASE and MONITOR_LEN reported by
Kumar earlier.

Since this board also supports the ability to boot off
the 64MB SODIMM flash, this change is forward looking
with that in mind; i.e. the settings for MONITOR_LEN
and ENV_SIZE will work when the 512k sectors of the
SODIMM flash are used for alternate boot in the future.

Signed-off-by: Paul Gortmaker <>
Signed-off-by: Kumar Gala <>
Paul Gortmaker 2009-09-25 11:14:11 -04:00 committed by Kumar Gala
parent 8280912e06
commit dd9ca98f26
3 changed files with 42 additions and 4 deletions

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@ -24,5 +24,5 @@
# sbc8548 board
ifndef TEXT_BASE
TEXT_BASE = 0xfff80000
TEXT_BASE = 0xfffa0000

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@ -63,6 +63,30 @@ a 33MHz PCI configuration is currently untested.)
Updating U-boot with U-boot:
Note that versions of u-boot up to and including 2009.08 had u-boot stored
at 0xfff8_0000 -> 0xffff_ffff (512k). Currently it is being stored from
0xfffa_0000 -> 0xffff_ffff (384k). If you use an old macro/script to
update u-boot with u-boot and it uses the old address, you will render
your board inoperable, and you will require JTAG recovery.
The following steps list how to update with the current address:
tftp u-boot.bin
md 200000 10
protect off all
erase fffa0000 ffffffff
cp.b 200000 fffa0000 60000
md fffa0000 10
protect on all
The "md" steps in the above are just a precautionary step that allow
you to confirm the u-boot version that was downloaded, and then confirm
that it was copied to flash.
Hardware Reference:

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@ -330,7 +330,14 @@
#define CONFIG_SYS_MONITOR_LEN (256 * 1024) /* Reserve 256 kB for Mon */
* For soldered on flash, (128kB/sector) we use 2 sectors for u-boot and
* one for env+bootpg (TEXT_BASE=0xfffa_0000, 384kB total). For SODIMM
* flash (512kB/sector) we use 1 sector for u-boot, and one for env+bootpg
* (TEXT_BASE=0xfff0_0000, 1MB total). This dynamically sets the right
* thing for MONITOR_LEN in both cases.
#define CONFIG_SYS_MALLOC_LEN (128 * 1024) /* Reserved for malloc */
/* Serial Port */
@ -448,9 +455,16 @@
* Environment
#define CONFIG_ENV_SECT_SIZE 0x40000 /* 256K(one sector) for env */
#define CONFIG_ENV_SIZE 0x2000
#if TEXT_BASE == 0xfff00000 /* Boot from 64MB SODIMM */
#define CONFIG_ENV_SECT_SIZE 0x80000 /* 512K(one sector) for env */
#elif TEXT_BASE == 0xfffa0000 /* Boot from 8MB soldered flash */
#define CONFIG_ENV_SECT_SIZE 0x20000 /* 128K(one sector) for env */
#warning undefined environment size/location.
#define CONFIG_LOADS_ECHO 1 /* echo on for serial download */
#define CONFIG_SYS_LOADS_BAUD_CHANGE 1 /* allow baudrate change */