Re: [ECOS] Redboot: No network interfaces found on olimex lpc-l2294 board

[Sergei Gavrikov <w3sg at softhome dot net>]

Alexey Shusharin writes:
> Bronislav Gabrhelik wrote: 
> > Curently I use redboot image from Sergei's Gavrikov site
> > (http://sgs.gomel.by/sg/downloads/olpcx2294-latest) and it works fine.
> > Sergei did great job.
> > 
> > I want do make my own image from current sources. I applied patch for
> > ethernet drive cs8900  + applied epk file to add new hardware as
> > described on Sergei's site.
> > My platform is cygwin + arm-elf-gcc 4.0.2 + ecos Configuration Tool
> > 
> > When I compile redboot it shows that "No network interfaces found".
> > After some research in sources I found out that it must be
> > cs8900a_init what fails. I noticed that there are some diag_printf()
> > logging under compile condition #if DEBUG & 8.
> > So I added into common build options for cs8900a -DDEBUG=0xf to switch
> > on all printfs. But build with this option found network interface and
> > also redboot obtained the ip address from DHCP server. So it worked.
> > Finally I found out that if was option -DDEBUG=0x2 which made that
> > everything works fine. The compilation condition #if DEBUG & 2 is used
> > in get_reg() and put_reg(), so it slows down writing and reading
> > into/from cs8900a. The cs8900a chip is connected through External
> > Memory Controler and mapped into memory space at address 0x82000000. I
> > suspected that  BCFG2 is different in my image, but after some playing
> > with arm-elf-objdump -D an comparing of dissassembled code I rejected
> > it. Note that dissassemled code is different, it uses different
> > registers, but roughly it is very similar.
> > 
> > When I set option -DDEBUG=0x8 it doesn't work and It shows that
> > "CS8900 didn't reset - abort!". I verified in dissassembled code that
> > the "callback" CYGHWR_CL_CS8900A_PLF_POST_RESET is called.
> > 
> > I don't know what I am doing wrong. I know that it is not bug in compiler :-).
> > I suspect that I missed set some parameter in config tool. I am
> > atttaching ecm file.
> > 
> > TIA for any hint.
> > Bronislav Gabrhelík
> 
> Hi
> 
> I had the same problem then i was using olpcl2294. Sergei's port has a
> small bug. He don't use volatile keyword and i think compiler reject
> code which activates 16-bit mode of cs8900A. For me this bug appears
> only for olpcl2294. olpce2294 works fine in 8-bit mode.
> 
> You should change several lines in ethernet driver (for me it's a
> devs_eth_arm_olpcl2294.inl).
> 
> 
> Sergei's code:
> 
> static __inline__ void post_reset(cyg_addrword_t base)
> {
>     // Toggle A0 connected to the SBHE# line
>     *(char *)0x82000000 = 1;
>     *(char *)0x82000001 = 2;
>     *(char *)0x82000000 = 3;
>     *(char *)0x82000001 = 0;
> }
> 
> Your code:
> 
> static __inline__ void post_reset(cyg_addrword_t base)
> {
>     // Toggle A0 connected to the SBHE# line
>     (*(volatile char *)0x82000001) = 0x00;
>     (*(volatile char *)0x82000000) = 0x00;
>     (*(volatile char *)0x82000001) = 0x00;
> }
> 
> And i recommend to add lines after this function to call it after
> hardware reset:
> 
> #undef CYGHWR_CL_CS8900A_PLF_INIT
> #define CYGHWR_CL_CS8900A_PLF_INIT(cpd) post_reset(cpd->base)
> 
> 
> And more...
> If you are going to use this port for application (not only for RedBoot)
> you should fix one more bug. olpcl2294 HAL doesn't configure EINT2, and
> it's used by default (level-sensitivity and low-active mode). But for
> work with CS8900A it must be in level-sensitivity and high-active mode.
> So you should make call hal_interrupt_configure somewhere in HAL
> initialising procedure before network init:
> 
> hal_interrupt_configure(CYGNUM_HAL_INTERRUPT_EINT2, 0, 1);
> 
> Best regards
> Alexey Shusharin

Hello Alexey,

It seems that I should check the stuff is placed on web. My local copy
the lpcl2294_misc.c has

#ifdef HAL_PLF_HARDWARE_INIT
//--------------------------------------------------------------------------
// hal_plf_hardware_init --
//
void
hal_plf_hardware_init (void)
{
    // configure IRQ level from CL CS8900A
    cyg_drv_interrupt_configure (CYGNUM_HAL_INTERRUPT_EINT2, 0, 1);
}
#endif // HAL_PLF_HARDWARE_INIT

ASAP, I'll upgrade the web stuff, if that will be needed.

Thank you,

Sergei

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