[U-Boot-Users] Excluding Env Variable section from the u-boot.bin

[Albert David]

Dears,
For my ppc405EP based custom board I would like to make few changes to
the u-boot memory map, so that every time I update the u-boot,
environment variables in the flash remain untouched.

Flash Memory used:S29GL128M(spansion 16MB Flash with 128 uniform
sectors of 128KB each)

Current mapping
U-Boot Start Flash Address 0xFFF60000 		- 2 sectors
U-Bot Env Variable Start Addr 0xFFFA000		- 1 sector
U-Bot Env Variable(Redundant)Start Addr 0xFFFC000	- 1 sector
U-Boot End sector				- 1 sector

Size of the binary output of u-boot(u-boot.bin) after build is 
128kb*5sectors=648Kbytes.

Current settings in the source tree:

U-boot-1.1.4/include/configs/my_board.h
#define CFG_FLASH_BASE		0xFFF60000
#define CFG_MONITOR_BASE	CFG_FLASH_BASE
#define CFG_MONITOR_LEN		(640 * 1024)

#define CFG_ENV_IS_IN_FLASH	1
#define CFG_ENV_ADDR		0xFFFA0000
#define CFG_ENV_SECT_SIZE	0x20000
#define CFG_ENV_ADDR_REDUND	0xFFFC0000
#define CFG_ENV_SIZE_REDUND	0x20000

U-boot-1.1.4/my_board/config.mk
TEXT_BASE = 0xFFF60000

U-boot-1.1.4/my_board/u-boot.lds
  ppcenv_assert = ASSERT(. < 0xFFFA0000, ".bss section too big,
overlaps .ppcenv section. Please update your confguration:
CFG_MONITOR_BASE, CFG_MONITOR_LEN and TEXT_BASE may need to be
modified.");
  . = 0xFFFA0000;
  .ppcenv :
  {
    common/environment.o(.ppcenv);
  }





Required mapping:
U-Bot Env Variable Start Addr 0xFFF8000		- 1 sector
U-Bot Env Variable(Redundant)Start Addr 0xFFFA000	- 1 sector
U-Boot Start Flash Address 0xFFFC0000 		- 2 sectors

Required Size of the binary output of u-boot(u-boot.bin) after build
is  128kb*2sectors=256Kbytes.

I have already tried to modify the above specified files to:

U-boot-1.1.4/include/configs/my_board.h
#define CFG_FLASH_BASE		0xFFFC0000
#define CFG_MONITOR_BASE	CFG_FLASH_BASE
#define CFG_MONITOR_LEN		(256 * 1024)

#define CFG_ENV_IS_IN_FLASH	1
#define CFG_ENV_ADDR		0xFFF80000
#define CFG_ENV_SECT_SIZE	0x20000
#define CFG_ENV_ADDR_REDUND	0xFFFA0000
#define CFG_ENV_SIZE_REDUND	0x20000

U-boot-1.1.4/my_board/config.mk
TEXT_BASE = 0xFFFC0000

U-boot-1.1.4/my_board/u-boot.lds
  ppcenv_assert = ASSERT(. < 0xFFF80000, ".bss section too big,
overlaps .ppcenv section. Please update your confguration:
CFG_MONITOR_BASE, CFG_MONITOR_LEN and TEXT_BASE may need to be
modified.");
  . = 0xFFF80000;
  .ppcenv :
  {
    common/environment.o(.ppcenv);
  }

But after doing "make all" I get the message
ppc_4xx-ld:.bss section too big, overlaps .ppcenv section. Please
update your confguration: CFG_MONITOR_BASE, CFG_MONITOR_LEN and
TEXT_BASE may need to be modified.

In a simple term, I wanted to build my u-boot by excluding environment
variable section of the memory..

Can any one help me?

Where am I going wrong??

Is there any other modification needs to be done other than the above
specified changes?

Thanks in advance for your support,
With best regards,
Albert.