From: Wolfgang Denk <wd@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] arch/powerpc/cpu/ppc4xx/start.S: comment makes little sense
Date: Sun, 21 Nov 2010 20:17:01 +0100 [thread overview]
Message-ID: <20101121191701.DFCF1678@gemini.denx.de> (raw)
Dear Stefan,
I think this comment in arch/powerpc/cpu/ppc4xx/start.S needs a bit of
cleanup:
51 /* U-Boot - Startup Code for AMCC 4xx PowerPC based Embedded Boards
52 *
53 *
54 * The processor starts at 0xfffffffc and the code is executed
55 * from flash/rom.
56 * in memory, but as long we don't jump around before relocating.
57 * board_init lies at a quite high address and when the cpu has
58 * jumped there, everything is ok.
59 * This works because the cpu gives the FLASH (CS0) the whole
60 * address space at startup, and board_init lies as a echo of
61 * the flash somewhere up there in the memorymap.
62 *
63 * board_init will change CS0 to be positioned at the correct
64 * address and (s)dram will be positioned at address 0
65 */
All this makes pretty little sense to me.
Thanks.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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next reply other threads:[~2010-11-21 19:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-21 19:17 Wolfgang Denk [this message]
2010-11-23 5:51 ` [U-Boot] arch/powerpc/cpu/ppc4xx/start.S: comment makes little sense Stefan Roese
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