Re: [ECOS] Re: Leon3 compatible with LAN91C111?

[Tapio Koskinen <tapio dot koskinen at tut dot fi>]

> The correct config command for leon3 and LANC91C111 is thus:
>
> ecosconfig new sparc_leon3 net
> ecosconfig add CYGPKG_DEVS_ETH_SMSC_LAN91CXX CYGPKG_DEVS_ETH_SPARC_LEON3
> ecosconfig tree
> make tests

Great. I tried to add packages using configtool but it didn't let me and 
I assumed ecosconfig wouldn't do it either.

> > Also it was strange that endianess conversion wasn't
> > needed even though Leon3 is big endian and LAN-controller little endian.
> Endian conversion is typically done at the board level
> by swapping the byte lanes. This is the case on the Nuhorizon
> Spartan3 board, the Altera Nios boards, and on the GR-CPCI-AX
> board from Pender. Which board are you using?

It is Altera's Nios board.

After doing the above and removing endianess conversion calls from the 
eCos code the following changes were needed for Ethernet to work (only 
half of the 91C111's registers were working originally):
- /devs/eth/sparc/leon3/current/include/devs_eth_leon3.inl
  - #define CYGNUM_DEVS_ETH_SMSC_LAN91CXX_SHIFT_ADDR 1
- /devs/eth/smsc/lan91cxx/current/src/smsc_lan91cxx.h
  - In get_reg-function HAL_READ_UINT16 was replaced with HAL_READ_UINT32.
- /devs/eth/smsc/lan91cxx/current/src/if_lan91cxx.c
  - Calls to function CYGACC_CALL_IF_DELAY_US were replaced with
HAL_DELAY_US (linker failed without this).

Changes to if_lan91cxx.c were made to version 1.20 in
CVS-repository. In configtool "Ethernet register's address" was changed
to 0x20000300.

Shifting and read_uint32 changes were made to fool amba-bus to set byte 
enables correctly when reading 91C111's registers. Shifting was negated 
in hardware (probably in smc_mctrl.vhd).

Tapio

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