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ARM: Not able to erase FLASH BANK A in lpc1837

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Hi, I am using LPC1837, I am using Flash Erase Page using IAP commands as follows /* Erase page */ IAP.cmd = CMD_ERASE_PAGE; IAP.par[0] = u4l_flash_start_addr; IAP.par[1] = u4l_flash_end_addr; IAP.par[2] = u4g_Flash_Clk; /*180000*/ IAP_Call (&IAP.cmd, &IAP.stat); This above command is working fine, when erasing/writing at FLASH BANK B. But When i am trying to erase flash bank A by giving its address, i am not able to erase. Actually the code execut

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