EK-TM4C1294XL: how to enter to bootp mode

Hello Micha

Please describe what setup you are using, application code, etc?

I'm using EK-TM4C1294XL board with CCS6

Using this method:
forum.43oh.com/.../

Hello Micha

AFAIK the Ethernet Boot loader can be re-invoked over the network by issuing a reset command.

Please explaine.
When I hit reset key (Hardware reset) , the CPU go to the Boot loader address, or jump to start address of the program ?
what do you mean reset command ?

Hello Micha

If the application firmware is not fully in place, then on a reset (hardware) the boot loader shall be invoked.

In case of a broken link when a firmware upgrade is in process, the application firmware is not in place. As a result when the network connectivity is re-established, the boot loader will again be invoked and the application firmware can be redownloaded

Hi

What are the conditions for "not fully in place" ?

If I start to program the flash , and the link is broken 2-3 bytes before the end, or after 100 bytes from start , does the hard reset software recognize this condition and jump to boot loader ?

Can you provide some doc or source code , what the CPU internal ROM software check when we hit hard reset ?

thanks

Hello Micha

The Boot Loader checks for the SP and PC values programmed for the application program. If the SP and PC do not match as SRAM and valid Flash address, then it assumes that the application firmware is not in place. We cannot provide any document on the Internal ROM software check as that is a TI propitiatory code,

Hi

Does the SP and PC check ALL the time or only after hard reset ?

If TI check this only after hard reset then this CPU has bug!!!

Suppose we use remote program the flash , and there is disconnected cable just before the end.

After hard reset , the CPU will have correct PC and SP, and it start to run , but after a while the program will stack , and I can not go remotely to the boot loader any more, We have to open the system , and connected JTAG programmer to installed the SW again.

TI need to provide some HW mean to force the CPU to enter to boot loader , example :

fore one CPU pin to Hi/Low during hard reset .

thanks

Micha Nisani said:

TI need to provide some HW mean to force the CPU to enter to boot loader , example :

fore one CPU pin to Hi/Low during hard reset .

See the description of the Boot Configuration (BOOTCFG) register.

Hello Micha

The SP and PC are last 2 locations that are flashed into the application code. So even if the cable got disconnected the probability of a corrupted SP and PC is extremely remote. As of the rest of the question, Chester provided an answer...