On Thu, Feb 09, 2012 at 03:45:44PM -0500, Robert P. J. Day wrote: > > a preliminary question to make sure i'm on the right track in terms > of adding panda ES support. i have a couple panda boards -- an > earlier EA3 revision (OMAP 4430), and a panda ES (OMAP 4460). > > using a regular panda config and build, i can boot the earlier > board: > > barebox 2012.02.0-00090-g675502d-dirty (Feb 8 2012 - 17:03:18) > > Board: Texas Instrument's Panda > PandaBoard Revision: 003 > ehci@ehci0: USB EHCI 1.00 > Malloc space: 0x8d000000 -> 0x8effffff (size 32 MB) > Stack space : 0x8cff8000 -> 0x8d000000 (size 32 kB) > Open /boot/bareboxenv No such file or directory > no valid environment found on /boot/bareboxenv. Using default > environment > running /env/bin/init... > > so that's a good sign. and the Revision number of 3 matches what i > see here: > > http://omappedia.org/wiki/PandaBoard_Revisions#PandaBoard_Revision_History > > so far, so good. > > now if i use precisely the same files for my ES, i get absolutely no > output. none. but that's not surprising since in the omap4_generic.c > file, i read: > > unsigned int omap4_revision(void) > { > unsigned int chip_rev = 0; > unsigned int rev = cortex_a9_rev(); > > switch(rev) { > case 0x410FC091: > return OMAP4430_ES1_0; > case 0x411FC092: > chip_rev = (readl(OMAP44XX_CTRL_BASE + 0x204) >> 28) & 0xF; > if (chip_rev == 3) > return OMAP4430_ES2_1; > else if (chip_rev >= 4) > return OMAP4430_ES2_2; > else > return OMAP4430_ES2_0; > } > return OMAP4430_SILICON_ID_INVALID; > } > > i'm assuming the fact there is *no* checking for an OMAP4460 is the > reason i get nothing, is that a reasonable assumption? i'll post more > detail later about what i'm going to try but given that the above > function does not take into account the OMAP4460-based ES boards, > would that cause a complete lack of output at boot time? thanks. This seems to be a good start to look for differences. Also it's worth to grep for users of omap_revision() in U-Boot Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
