[U-Boot-Users] U-Boot 750FX CPU support
I'm adding support for the IBM 750FX processor and I have a question about how to add this support in the u-boot/cpu/74xx directory. The files that would be affeted are
start.S - to accommodate the additional 8 BATS (total 8 instruction, 8 data) routines effected: invalidate_bats(), setup_bats() speed.c - the 750FX needs a unique multiplier table (hid1_multipliers_x_10) routines effected: get_clocks()
Should this be #ifdef CONFIG_750FX build rule? If not, should there be some processor identification in the routines effected to take the correct action? This would be unique to the 750FX right now but future CPUs may need this too.
Thanks,
Tom
Dear Tom,
in message 92E171C34A30D51193CA000103CE74F003790A0B@CAREX you wrote:
I'm adding support for the IBM 750FX processor and I have a question about how to add this support in the u-boot/cpu/74xx directory. The files that would be affeted are
I guess you mean cpu/74xx_7xx/ ?
start.S - to accommodate the additional 8 BATS (total 8 instruction, 8 data) routines effected: invalidate_bats(), setup_bats() speed.c - the 750FX needs a unique multiplier table (hid1_multipliers_x_10) routines effected: get_clocks()
Should this be #ifdef CONFIG_750FX build rule? If not, should there be some processor identification in the routines effected to take the correct action? This would be unique to the 750FX right now but future CPUs may need this too.
I think it makes sense to add this using a CONFIG_750FX #define; if it turns out that (many) other CPUs will need this, we may optimize this later.
Happy hacking!
Wolfgang Denk
participants (2)
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Tom Guilliams -
Wolfgang Denk