From: Mark Jonas <mark.jonas@motorola.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] [PATCH] MPC5200: Remove CSBOOT / CS0 configuration from start.S
Date: Tue, 13 Apr 2004 12:30:42 +0200 [thread overview]
Message-ID: <407BC152.1060308@motorola.com> (raw)
Hello,
the attached patch fixes the problem that the current start.S for
MPC5200 contains code to initialize CSBOOT / CS0 timing, bus width and
other configuration.
lis r3, 0x00047800 at h
ori r3, r3, 0x00047800 at l
stw r3, 0x300(r4) /* set timing, CS0/boot conf reg */
Right now that only works because all U-Boot supported MPC5200 boards
are very Lite5200 (aka IceCube 5200) like. Once there is a board which's
Flash is is connected in 24 bits address, 8 bits data, non-multiplexed
mode this will break.
Additionally, the patch removes enabling of the IPBI wait states. This
is not needed because IP bus is not configured to run with > 66 MHz in
U-Boot and if needed this should be done always and not only when
performing a low boot.
Interesting enough U-Boot already has a solution for setting tuned CS0
timings. This is done using the CFG_BOOTCS_CFG define which is applied
in cpu/mpc5xxx/cpu_init.c.
Regards
Mark Jonas
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next reply other threads:[~2004-04-13 10:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-13 10:30 Mark Jonas [this message]
2004-04-18 23:10 ` [U-Boot-Users] [PATCH] MPC5200: Remove CSBOOT / CS0 configuration from start.S Wolfgang Denk
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