Hi,
In u-boot/board/ti/am57xx/board.c, function, vcores_init() appears to be
initializing a pointer to one of 2-3 tables which appear to contain a set
of voltage rails for all the cores on a given board.
I witnessed something a little funky last-night and I was wondering if you
might have some insight into what's going on. If you implement a simple
if, else statement (e.g. with two possible tables), then SPL boots.
However, if you implement an if : else if : else construct, the board
doesn't want to boot. I'm not sure what's going on here, but I'm wondering
if vcores_init has timing constraints? I know that the PMIC shuts
everything (or at least the A15 cores) down if you don't send a message to
it on the I2C bus to keep the cores powered on.
I'm wondering if vcores_init is called close to the end of this time
window??
If you use a simple if, else statement:
if (board_is_am572x_idk())
{
*omap_vcores = &am572x_idk_volts;
}
else
{
*omap_vcores = &beagle_x15_volts;
}
SPL loads and vectors to u-boot.
If, however, you code the following construct:
if (board_is_am572x_idk())
{
*omap_vcores = &am572x_idk_volts;
}
else if (board_is_am571x_idk())
{
*omap_vcores = &am571x_idk_volts;
}
else if (board_is_am572x_custom())
{
*omap_vcores = &beagle_x15_volts;
}
else
{
*omap_vcores = &beagle_x15_volts;
}
Then all that pops up on the boot console is 1-2 ASCII characters and then
everything APPEARS dead.
I have no idea what's going on, but I wonder if the additional assembly
code generated for the else if, else if could be delaying the "stay powered
on" I2C message which gets sent to the PMIC until after the PMIC has
already started the core power down ???
Thanks!
Jeff
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