Hi,
I have one question reagrding XIP Boot Options.
As you know, silicon revision 2.1 of AM3874 has one errata (Advisory 2.1.33).
At first, our customer thought to use MUX0 at XIP boot. But they found that some pins shared for other device(Ethernet). So they gave up to use MUX0, and they decided to use MUX1 instead of MUX0.
But AM3874 revision2.1 device has an errata "Advisory 2.1.33". So AM3874 does not multiplex the high-order address lines GPMC_A[27:13] during the XIP boot process. However customer would like to decode address "0800 0000h" for external memory. So they need to set A[27:13] = "1000 0000 0000 000b". it need to set A[27:20] = "1000 0000" ,at least. So they decided to use "M0" for A[27:20]. Because the PULL STATE of "M0" for A[26:20] is IPD and A[27] is IPU when OPTION B(BTMODE).
Also as I said the above first, they use "M1" for A[19-1]. This means they use both M0 and M1. Is this situation no problem? Please let me know.
Best regards,
Michi