[U-Boot] uboot auto restart on dm355,why?

[yaojin liu]

hi ,all.
I cannot use the nand flash, so i decide to load the uboot through UART,and
it works.
but it seems not stable , when i type help or printenv(or use the autoboot
delay, see followings), it will restart. but command "boot" or "setenv"(when
i uncomment autoboot delay) are ok.
I don't  have a emulator,and don't know how it goes.
I guess it is the ENV cause the problem,here are the macro i defined:

#if 0
#define CONFIG_SYS_USE_NAND
#define CFG_DAVINCI_STD_NAND_LAYOUT
//#define CONFIG_SYS_NAND_PAGE_2K

#define CONFIG_NAND_DAVINCI
#undef CONFIG_ENV_IS_IN_FLASH
#define CONFIG_SYS_NO_FLASH
#define CONFIG_ENV_IS_IN_NAND /* U-Boot env in NAND Flash  */
//#define CONFIG_ENV_SECT_SIZE 0x40000 /* Env sector Size */
#define CONFIG_ENV_OFFSET 0x30000 /* environment starts here*/
#endif

#define CONFIG_SYS_NO_FLASH
#define CONFIG_ENV_IS_NOWHERE  /*env readonly*/
#define CONFIG_ENV_IS_IN_NVRAM
#define CONFIG_ENV_ADDR 0x82000000
#define CONFIG_ENV_SIZE SZ_16K
//#define CONFIG_ENV_SIZE SZ_256K

#define CONFIG_SYS_NAND_BASE 0x02000000
//#define CONFIG_SYS_NAND_HW_ECC
//#define CFG_DAVINCI_STD_NAND_LAYOUT
//#define CONFIG_SYS_NAND_4BIT_HW_ECC
//#define CONFIG_SYS_NAND_4BIT_HW_ECC_OOBFIRST /**/
#define CONFIG_SYS_MAX_NAND_DEVICE 1 /* Max number of NAND devices=2 */
#define CONFIG_MASK_CLE 0x10 /
#define CONFIG_MASK_ALE 0x08

#define CONFIG_SYS_NAND_BASE_LIST
 {CONFIG_SYS_NAND_BASE,CONFIG_SYS_NAND_BASE + 0x4000}

#define CONFIG_SKIP_LOWLEVEL_INIT /* U-Boot is loaded by a bootloader */
#define CONFIG_SKIP_RELOCATE_UBOOT /* to a proper address, init done */
#define DEF_BOOTM ""

/////////////////////////////and here is the output://////////////////
DM3xx=>>: U-Boot 2009.03 ( 7??? 15 2010 - 14:12:54)
DM3xx=>>: I2C:   ready
DM3xx=>>: DRAM:  128 MB
DM3xx=>>: NOT ENV_IS_EMBEDDED
DM3xx=>>: Using default environment
DM3xx=>>: In:    serial
DM3xx=>>: Out:   serial
DM3xx=>>: Err:   serial
DM3xx=>>: ARM Clock :- 216MHz
DM3xx=>>: DDR Clock :- 171MHz
DM3xx=>>: MTD Layout:
DM3xx=>>:   UBL=0x0000-0x3FFF(16KB),Uboot=0x4000-0x33FFF(176+env.16KB)
DM3xx=>>:   Kernel=0x34000-0x2B3FFF(2.5MB),FS=0x2B4000-0x3FFFFFF (61.2MB

DM3xx=>>: Hit any key to stop autoboot:  3  BOOTME
DM3xx=>>:  BOOTME
DM3xx=>>:  BOOTME
DM3xx=>>:  BOOTME
DM3xx=>>:  BOOTME
........
and then it comes to the reboot procedure .BOOTME is the first string when
boot from UART.

/////////////////so i comment some code int static __inline__ int
abortboot(int bootdelay):
#if 0
while ((bootdelay > 0) && (!abort))
{
int i;

--bootdelay;
/* delay 100 * 10ms */
for (i=0; !abort && i<100; ++i)
{
if (tstc())
{ /* we got a key press */
abort  = 1; /* don't auto boot */
bootdelay = 0; /* no more delay */
#ifdef CONFIG_MENUKEY
menukey = getc();
#else
(void) getc();  /* consume input */
#endif
break;
} //if
udelay(10000);
} //for

printf("\b\b\b%2d ", bootdelay);
}//end while
#endif

///////////////// now it will not restart anymore. but when i type help or
printenv ,it will restart again.
WHY? anyone can show me how to define the env when not using nand or nor
flash?

regards!