From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Mon, 09 Feb 2015 18:52:15 +0100 Subject: [U-Boot] [PATCH] mx53loco: Fix boot hang during reboot stress test In-Reply-To: <1423474173-3749-1-git-send-email-festevam@gmail.com> References: <1423474173-3749-1-git-send-email-festevam@gmail.com> Message-ID: <54D8F3CF.4020102@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Fabio, On 09/02/2015 10:29, Fabio Estevam wrote: > From: Fabio Estevam > > Currently by running the following test: > > => setenv bootcmd reset > => save > => reset > > , we observe a hang after approximately 20-30 minutes of stress reboot test. > > Investigation of this issue revealed that when a single DDR chip select is used, > the hang does not happen. It only happens when the two chip selects are active. > > MX53 reference manual states at "28.6.2 Memory ZQ calibration sequence": > > "The controller must keep the memory lines quiet (except for CK) for the ZQ > calibration time as defined in the Jedec (512 cycles for ZQCL after reset, 256 > for other ZQCL and 64 for ZQCS)." > > According to the SDE_0 and SDE_1 bit descriptions from register ESDCTL_ESDCTL: > > "Writing 1 to SDE0 or SDE1 will initiate power up delays as JEDEC defines. > Power up delays are a function of the configured memory type (DDR2/DDR3/LPDDR2)" > > So make sure to activate one chip select at time (CS0 first and then CS1 later), > so that the required JEDEC delay is respected for each chip select. > > With this change applied the board has gone through three days of reboot stress > test without any hang. > > Signed-off-by: Fabio Estevam > --- > board/freescale/mx53loco/imximage.cfg | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/board/freescale/mx53loco/imximage.cfg b/board/freescale/mx53loco/imximage.cfg > index d1c1931..a5f1d98 100644 > --- a/board/freescale/mx53loco/imximage.cfg > +++ b/board/freescale/mx53loco/imximage.cfg > @@ -59,7 +59,7 @@ DATA 4 0x63fd9090 0x4d444c44 > DATA 4 0x63fd907c 0x01370138 > DATA 4 0x63fd9080 0x013b013c > DATA 4 0x63fd9018 0x00011740 > -DATA 4 0x63fd9000 0xc3190000 > +DATA 4 0x63fd9000 0x83190000 > DATA 4 0x63fd900c 0x9f5152e3 > DATA 4 0x63fd9010 0xb68e8a63 > DATA 4 0x63fd9014 0x01ff00db > @@ -72,6 +72,7 @@ DATA 4 0x63fd901c 0x00008033 > DATA 4 0x63fd901c 0x00028031 > DATA 4 0x63fd901c 0x052080b0 > DATA 4 0x63fd901c 0x04008040 > +DATA 4 0x63fd9000 0xc3190000 > DATA 4 0x63fd901c 0x0000803a > DATA 4 0x63fd901c 0x0000803b > DATA 4 0x63fd901c 0x00028039 > Good catch ! Acked-by: Stefano Babic Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de =====================================================================