Because the golden bitstream for SPEC has syscon at offset 0x0.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This is useful for example when using a secondary onewire controller.

This reverts commit 7e2ee9b4.

You can't put a bitstream into the middle of a tiny EEPROM.
If you intend to build an sdbfs for a switch, make a new image.

Alessandro Rubini authored 11 years ago and Grzegorz Daniluk committed 10 years ago

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Alessandro Rubini authored 11 years ago and Grzegorz Daniluk committed 10 years ago

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

The optimization is the removal of the retval variable in
bbspi_transfer() and using the val parameter as a "shift register"
that is returned at the end of the function.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

How-to guide for the tool (together with flash-write tool) can be found in
sdbfs.README.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

SQUASH remove flash-read binary: 598d cdf68

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

The issue was due to a bug in gpio_in, which was doing an AND with
the value of GPIO_SPI_MISO, which was set to the pin offset, instead
of what it was set in the include/syscon.h file.

When I copied the gpio functions from include/syscon.h, I overlooked
the fact that the pins for the gpio functions there are set using
wbgen macros that actually perform the shifting, and I simply copied
the functions and redefined the GPIO_SPI_MISO macros as offsets.

The issue has been fixed by redefining the gpio_in function as an
AND with the value (1 << PIN_NR). This fixes everything.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

For this to work, I also had to add (in flash.c) setting the
entry-point to the right value (the one where the SDB magic is
detected).

The rest of the commit files are just toying around for testing
purposes.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

There was somewhat of a bug in the spec_write_flash function of
flash-write. The memcpy function was not functioning 'as expected',
so I changed the fixed-size buffer for a pointer and malloc-ed it
to the size. This seems to fix the bug.

The issue about reading the flash status register has yet to be
fixed.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Theodor-Adrian Stana authored 11 years ago and Grzegorz Daniluk committed 10 years ago

The flash-write tool is operational. The call to read status register
from flash-host is not working yet, and that is to be solved. In the
meantime, there are sleep functions inserted where we're supposed
to poll the status register.

Signed-off-by: Theodor Stana <t.stana@cern.ch>

Alessandro Rubini authored 10 years ago and Grzegorz Daniluk committed 10 years ago

The global pointer is used by some special assembly instructions
that we are not using (i.e., the compiler is not generating them
for us, because we don't use PIC or other "strange" stuff.

So, we'd better remove an assignement in the linker script that makes
little sense (it must be a typo of some kind, in the dark ages of this
code base).

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

tools/trivial-init: a small footprint, delay-free WRPC firmware for VHDL/Verilog simulations (initial commit)

The associated README explains how to use this stuff with w1 eeprom.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This reads to stdout, in binary format. With "-v" it prints text and
scans the bus too. The examples here below use the same card (and same
data) as in commit "d44ace7e

 w1: complete eeprom low-level support".

   spusa.root# ./tools/wrpc-w1-read -b 2 0 5 | od -t u1 -Ax -w1
   000000  40
   000001  41
   000002  42
   000003 243
   000004 244

   spusa.root# ./tools/wrpc-w1-read -v -b 2 30 6
   ./ohwr/wrpc-sw/tools/wrpc-w1-read: found device 10dc:018d: 0000:02:00.0
   ./ohwr/wrpc-sw/tools/wrpc-w1-read: found device 10dc:018d: 0000:04:00.0
   device 0: 68000801dce56910
   device 1: 5b0000036c567628
   device 2: f70000001eda8242
   device 3: 5f00000040e50143
   Reading device on bus 2: offset 30 (0x1e), len 6
   offset   30 (0x01e):  11 (0x0b)
   offset   31 (0x01f):  22 (0x16)
   offset   32 (0x020):  33 (0x21)
   offset   33 (0x021):  44 (0x2c)
   offset   34 (0x022):  55 (0x37)
   offset   35 (0x023):  66 (0x42)

Signed-off-by: Alessandro Rubini <rubini@...>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Mainly, this removes the shell commands and the inclusion of <wrc.h>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>