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 paul.gortmaker@windriver.com --- board/sbc8548/config.mk | 2 +- doc/README.sbc8548 | 24 ++++++++++++++++++++++++ include/configs/sbc8548.h | 20 +++++++++++++++++--- 3 files changed, 42 insertions(+), 4 deletions(-)

diff --git a/board/sbc8548/config.mk b/board/sbc8548/config.mk index 440d650..b2013d6 100644 --- a/board/sbc8548/config.mk +++ b/board/sbc8548/config.mk @@ -24,5 +24,5 @@ # sbc8548 board # ifndef TEXT_BASE -TEXT_BASE = 0xfff80000 +TEXT_BASE = 0xfffa0000 endif diff --git a/doc/README.sbc8548 b/doc/README.sbc8548 index d72d97d..6cbe12f 100644 --- a/doc/README.sbc8548 +++ b/doc/README.sbc8548 @@ -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: ===================

diff --git a/include/configs/sbc8548.h b/include/configs/sbc8548.h index d10792a..aeac2de 100644 --- a/include/configs/sbc8548.h +++ b/include/configs/sbc8548.h @@ -330,7 +330,14 @@ #define CONFIG_SYS_GBL_DATA_OFFSET (CONFIG_SYS_INIT_RAM_END - CONFIG_SYS_GBL_DATA_SIZE) #define CONFIG_SYS_INIT_SP_OFFSET CONFIG_SYS_GBL_DATA_OFFSET

-#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_MONITOR_LEN (~TEXT_BASE + 1) #define CONFIG_SYS_MALLOC_LEN (128 * 1024) /* Reserved for malloc */

/* Serial Port */ @@ -448,9 +455,16 @@ * Environment */ #define CONFIG_ENV_IS_IN_FLASH 1 -#define CONFIG_ENV_ADDR (CONFIG_SYS_MONITOR_BASE + 0x40000) -#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_ADDR (CONFIG_SYS_MONITOR_BASE + 0x80000) +#define CONFIG_ENV_SECT_SIZE 0x80000 /* 512K(one sector) for env */ +#elif TEXT_BASE == 0xfffa0000 /* Boot from 8MB soldered flash */ +#define CONFIG_ENV_ADDR (CONFIG_SYS_MONITOR_BASE + 0x40000) +#define CONFIG_ENV_SECT_SIZE 0x20000 /* 128K(one sector) for env */ +#else +#warning undefined environment size/location. +#endif

#define CONFIG_LOADS_ECHO 1 /* echo on for serial download */ #define CONFIG_SYS_LOADS_BAUD_CHANGE 1 /* allow baudrate change */