Martin Rösch <martin.roesch <at> neratec.com> writes: > > Hi, > > On 2011-01-28, Grant Edwards <grant.b.edwards <at> gmail.com> wrote: > > I'm curious why you want to do this. What benefit does it provide? > > I have to link a C++ Application to eCos (with FreeBSD Stack and uSTL) on a STM32 derived board. > The footprint is to big to run it from the internal flash. So we decided to run it from external RAM. > Unfortunately the performance regarding IRQ handling of a RAM Application is too bad: > Using the timers test from the STM32 variant HAL, I've set only TIM1 active and then varied the update > interrupt period. It turned out, that with a period of 20msec. the IRQ handler run into an Assertion in > the post_dsr() function: > ASSERT FAIL: <5>intr.cxx[292]void Cyg_Interrupt::post_dsr() DSR list is not empty but its head is 0 > > Doing the same test with a ROM Application, the period can be lowered to 50usec. > > So I'm trying to move the eCos library that contains the ISRs, DSRs etc. to the Internal Flash while keeping > the rest of the application (that has no ISRs and DSRs) still in the external RAM. > > I hope this Setup will improve the IRQ handling. > > Greetings, > > Martin >
Hi Martin, I am about to start a new project using ecos (need to posix os with tcp/ip stack) and I want to know roughly the footprint of the os. Do you know how much does ecos with tcp/ip stack consume? Thanks, Badreddine -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
