From 466f0137e8661fb62cbece1ce764f8369080c6e8 Mon Sep 17 00:00:00 2001 From: Heiko Schocher Date: Thu, 13 Jan 2011 08:25:00 +0100 Subject: mpc5200, digsy_mtc: add support for rev5 board version MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit difference to previous board version: - M29W128GH flash from Numonyx - SDRAM ISSI IS45S16800 (Option A2 105°C) - rev5 uses RTC RV-3029-C2 - update cs0 and cs1 baseaddr and length depending on the detected flash size. - added Werner Pfister as maintainer for the digsy board variants - As the M29W128GH needs a special flash_cmd_reset() document that in the new file doc/README.cfi. - move "#endif /* CONFIG_CMD_IDE */" to the right place - remove LOWBOOT config option for digsy_mtc and digsy_mtc_rev5 boards - change doc/README.cfi as Stefan Roese suggested Signed-off-by: Heiko Schocher Signed-off-by: Stefan Roese Acked-by: Detlev Zundel cc: Wolfgang Denk cc: Stefan Roese cc: Werner Pfister cc: Detlev Zundel --- doc/README.cfi | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 doc/README.cfi (limited to 'doc') diff --git a/doc/README.cfi b/doc/README.cfi new file mode 100644 index 0000000..d087ff0 --- /dev/null +++ b/doc/README.cfi @@ -0,0 +1,29 @@ +The common CFI driver provides this weak default implementation for +flash_cmd_reset(): + +void __flash_cmd_reset(flash_info_t *info) +{ + /* + * We do not yet know what kind of commandset to use, so we issue + * the reset command in both Intel and AMD variants, in the hope + * that AMD flash roms ignore the Intel command. + */ + flash_write_cmd(info, 0, 0, AMD_CMD_RESET); + flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); +} +void flash_cmd_reset(flash_info_t *info) + __attribute__((weak,alias("__flash_cmd_reset"))); + + +Some flash chips seems to have trouble with this reset sequence. In this case +the board specific code can override this weak default version with a board +specific function. For example the digsy_mtc board equipped with the M29W128GH +from Numonyx needs this version to function properly: + +void flash_cmd_reset(flash_info_t *info) +{ + flash_write_cmd(info, 0, 0, AMD_CMD_RESET); +} + +see also: +http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html -- cgit v1.1