edb93xx SDRAM initialization: Issue a precharge all command before forcing the
precharge of all SDRAM banks. Write to the SDRAM in order to force a precharge,
reading causes the edb93xx boards to hang
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Previous code ran the edb9302(a) boards with the PLL same settings as the
edb9301, at 166MHz core and 66MHz system bus clock. In difference to the edb9301
board the edb9302(a) is equipped with an EP9302 processor, which can be clocked
at higher rates than the EP9301. Therefore we can configure the edb9302(a) with
the same PLL settings as the other non-edb9301 boards, namely at 200MHz for
the core and 100MHz for the system bus clock.
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Before programming the SDRAM mode registers, mode register update mode must be
selected by setting the MRS bit and clearing INIT in GlConfig
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
edb93xx: The purpose of early_udelay() is to provide delay functionality in the
early board setup, when the stack isn't set up yet. With some compiler versions
the current implementation makes use of the stack and ends up crashing. Fix this
by removing an explicit division from early_udelay()
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
edb93xx: according to the datasheet UART1 needs to be enabled explicitly
Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Matthias Kaehlcke