When dropping jump block support, the assumption was that all bootroms
supported entry point redirection via the EVT1 register. Unfortunately,
this turned out to be incorrect for the oldest Blackfin parts (BF533-0.2
and older and BF561). No one really noticed earlier because these parts
usually are booted by bypassing the bootrom entirely, and older BF533
parts are not supported at all (too many anomalies).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Make sure we recurse through serial_putc() rather than bang on the UART
transmit register directly to avoid hardware overflows when using \n.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
DESCRIPTION:
The column address width settings for banks 2 and 3 are misconnected in
the SDRAM controller. Accesses to bank 2 will result in an error if the
Column Address Width for bank 3 (EB3CAW ) is not set to be the same as
that of bank 2.
WORKAROUND:
If using bank 2, make sure that banks 2 and 3 have the same column address
width settings in the EBIU_SDBCTL register. This must be the case
regardless of whether or not bank 3 is enabled.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
DESCRIPTION:
If the DF bit is set prior to a hardware reset, the PLL will continue to
divide CLKIN by 2 after the hardware reset, but the DF bit itself will be
cleared in the PLL_CTL register.
WORKAROUND:
Reprogram the PLL with DF cleared if the desire is to not divide CLKIN by
2 after reset.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
DESCRIPTION:
The Boot ROM is executed at power up/reset and changes the value of the
SICA_IWR registers from their default reset value of 0xFFFF, but does not
restore them.
WORKAROUND:
User code should not rely on the default value of these registers. Set
the desired values explicitly.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
When testing a u-boot binary that hasn't been booted from the bootrom, we
have to make sure the bootstruct structure has sane storage space. If we
don't, the initcode will crash when it tries to dereference an invalid
pointer.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
When initializing the core clocks, stick external memory into self-refresh.
This gains us a few cool things:
- support suspend-to-RAM with Linux
- reprogram clocks automatically when doing "go" on u-boot.bin in RAM
- make sure settings are stable before flashing new version
- finally fully unify initialize startup code path between LDR/non-LDR
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Some newer Blackfins (like the BF51x) do not have an on-chip voltage
regulator, so do not attempt to program the memory as if it does.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
If the board config does not specify an explicit EBIU_SDBCTL value, set it
up with sane values based on other configuration options.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Workaround anomaly 432:
The bfrom_SysControl() firmware function does not clear the SIC_IWR1
register before executing the PLL programming sequence. Therefore, any
interrupt enabled in the SIC_IWR1 register prior to the call to
bfrom_SysControl() can prematurely terminate the idle sequence required
for the PLL to relock properly. SIC_IWR0 is properly handled.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
The Boot ROM uses EVT1 as the entry point so set that rather than having
to use a tiny jump block in the default EVT1 location.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Looks like the initcode updates fell out of order during my merges. The
patch that really fixes up this code is part of power-on overhaul and so
is too large for merging at this point. Instead, we can disable the code
as no currently in-tree board depends on it. The next merge window will
fix things up properly.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Previously, booting over the UART required the baud rate to be known ahead
of time. Using a bit of tricky simple math, we can calculate the new board
rate based on the old divisors.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Newer Blackfin boot roms support using the fast SPI read command rather than
just the slow one. If the functionality is available, then use it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Some bits of the DDR MMRs should not be set. If they do, bad things may
happen (like random failures or hardware destruction).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Newer Blackfin's have an on-chip rom with a syscontrol() function that needs
to be used to properly program the memory and voltage settings as it will
include (possibly critical) factory tested bias values.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
As pointed out by Ivan Koryakovskiy, the initialization code was not
actually respecting the CONFIG_CLKIN_HALF option when configuring the
PLL_CTL register.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
All of the duplicated code for Blackfin processors and boot modes have been
unified. After all, the core is the same for all processors, just the
peripheral set differs (which gets handled in the drivers).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
