i.MX ProcessorsのトピックiMX25 - internal RAM used by ROM boot loader https://community.nxp.com/t5/i-MX-Processors/iMX25-internal-RAM-used-by-ROM-boot-loader/m-p/224560#M15614 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>I am writing some simple &amp; short test programs that I would like to load into the internal RAM of the iMX257 by using the ROM boot loader via the Serial Download Protocol (SDP) on UART1.&nbsp; I would like to know what (if any) memory regions within the internal RAM are used by the boot loader.&nbsp; The 128kbyte internal ram is mapped from 0x7800 0000 to 0x7801 FFFF with the last 64 bytes used for the interrupt vector table.&nbsp; Unfortunately I can not find any information in the reference manual concerning the boot loader's memory usage. I would like to place my programs in a region separate from what may be used by the ROM boot loader.&nbsp; </P><P></P><P>One other question...</P><P>From the reference manual, the boot loader uses the watchdog with a 90 second reset period.&nbsp; Does the watchdog get turned off when an application file is loaded via SDP and executed?&nbsp; Or is the application responsible for turning off (or resetting) the watchdog timer.</P><P></P><P>Thanks,</P><P>Ralph</P></BODY></HTML> Thu, 25 Jul 2013 23:52:51 GMT ralphlang 2013-07-25T23:52:51Z iMX25 - internal RAM used by ROM boot loader https://community.nxp.com/t5/i-MX-Processors/iMX25-internal-RAM-used-by-ROM-boot-loader/m-p/224560#M15614 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>I am writing some simple &amp; short test programs that I would like to load into the internal RAM of the iMX257 by using the ROM boot loader via the Serial Download Protocol (SDP) on UART1.&nbsp; I would like to know what (if any) memory regions within the internal RAM are used by the boot loader.&nbsp; The 128kbyte internal ram is mapped from 0x7800 0000 to 0x7801 FFFF with the last 64 bytes used for the interrupt vector table.&nbsp; Unfortunately I can not find any information in the reference manual concerning the boot loader's memory usage. I would like to place my programs in a region separate from what may be used by the ROM boot loader.&nbsp; </P><P></P><P>One other question...</P><P>From the reference manual, the boot loader uses the watchdog with a 90 second reset period.&nbsp; Does the watchdog get turned off when an application file is loaded via SDP and executed?&nbsp; Or is the application responsible for turning off (or resetting) the watchdog timer.</P><P></P><P>Thanks,</P><P>Ralph</P></BODY></HTML> Thu, 25 Jul 2013 23:52:51 GMT https://community.nxp.com/t5/i-MX-Processors/iMX25-internal-RAM-used-by-ROM-boot-loader/m-p/224560#M15614 ralphlang 2013-07-25T23:52:51Z