14580 firstBootloader restrict code size smaller than 32k?

Hi dialog staff

i develop my application on 14580 base sdk5.0.3 and my code size is about 32.4K, biger than otp 32K limit.
so i modified the scatter to support it (use UM-B-011),
and add a “coderLoader” call when sysinit, i burn the fw into flash and found it work well!
##### the code i add
"coderLoader" in system_ARMCM0.c and call it after systemInit fun
//#define BOOT_FROM_FLASH
#ifdef BOOT_FROM_FLASH
#define SYSRAM_CODE_START_ADDR 0x20008000L
#define SYSRAM_CODE_STOP_ADDR 0x20009200L
#define SYSRAM_CODE_SPI_ADDR 0x8008

void CodeLoader(void)
{
unsigned char *p_code;

if ((GetWord16(SYS_STAT_REG) & DBG_IS_UP) == DBG_IS_UP)
return;
SetWord16(P0_SET_DATA_REG,1<<3); // set P0_3 to high

SetBits16(SYS_CTRL_REG,PAD_LATCH_EN,1); // open pad latches
SetBits16(PMU_CTRL_REG,PERIPH_SLEEP,0); // exit power down peripheral
SetWord16(CLK_PER_REG, SPI_ENABLE);

SetWord16(P03_MODE_REG,PID_SPI_EN+OUTPUT); // set P0_3 spi cs (master mode, output)
SetWord16(P00_MODE_REG,PID_SPI_CLK+OUTPUT); // set P0_0 spi clk (master mode, output)
SetWord16(P06_MODE_REG,PID_SPI_DO); // set P0_6 spi mosi (data out)
SetWord16(P05_MODE_REG,PID_SPI_DI+INPUT_PULLUP); // set P0_5 spi miso (data in)

SetWord16(P0_SET_DATA_REG,1<<3); // Deactivate,

p_code = (unsigned char *)(SYSRAM_CODE_START_ADDR);

//init SPI for master, mode 3
SetWord16(SPI_CTRL_REG,0);
SetWord16(SPI_CTRL_REG,SPI_POL+SPI_PHA);
SetWord16(SPI_CTRL_REG,SPI_POL+SPI_PHA+SPI_ON+0x0100);

SetWord16(P0_RESET_DATA_REG,1<<3); // Enable FLASH with High low transition

SetWord16(SPI_RX_TX_REG1, 0x0300); // SPI_RX_TX_REG1 0x50001204
SetWord16(SPI_RX_TX_REG0, SYSRAM_CODE_SPI_ADDR); //SPI_RX_TX_REG0 0x50001202 //SYSRAM_CODE_SPI_ADDR 0x8008
而(GetBits16 (SPI_CTRL_REG SPI_INT_BIT) = = 0);//polling to wait for spi have data
SetWord16(SPI_CLEAR_INT_REG, 0x01); // clean pending flag

SetWord16(SPI_CTRL_REG,SPI_POL+SPI_PHA+SPI_ON); //SPI_CTRL_REG 0x50001200

while(p_code < (unsigned char *)SYSRAM_CODE_STOP_ADDR) //SYSRAM_CODE_STOP_ADDR 0x20009800L
{
SetWord16(SPI_RX_TX_REG0, 0x00); //SPI_RX_TX_REG0 (0x50001202) /* SPI RX/TX register0 */
而(GetBits16 (SPI_CTRL_REG SPI_INT_BIT) = = 0);//polling to wait for spi have data
*p_code++ = GetWord16(SPI_RX_TX_REG0); // read byte from SPI
SetWord16(SPI_CLEAR_INT_REG, 0x01); // clean pending flag
}

SetWord16(P0_SET_DATA_REG,1<<3); // Deactivate,
SetWord16(SPI_CTRL_REG, 0); // Reset SPI
}

but when i try to boot 580 by uart， i found it doesn’t work， so i guess is firstBootloader restrict code size smaller than 32k?
and do a confirmation ：
1. smartSnippets download secondaryBootloader by uart and it work
2.smartSnippets下载我的弗兰克-威廉姆斯uart 580 run secondaryBootloader, and this time, it work !!!!

can you explan it ?