From mboxrd@z Thu Jan 1 00:00:00 1970 From: See, Chin Liang Date: Tue, 17 Apr 2018 08:40:14 +0000 Subject: [U-Boot] [PATCH 1/5] ARM: socfpga: Add boot trampoline for Arria10 In-Reply-To: <20180415133704.18950-1-marex@denx.de> References: <20180415133704.18950-1-marex@denx.de> Message-ID: <1523954412.2582.13.camel@intel.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit To: u-boot@lists.denx.de Hi Marek, On Sun, 2018-04-15 at 15:37 +0200, Marek Vasut wrote: > The Arria10 uses slightly different boot image header than the Gen5 > SoCs, > in particular the header itself contains an offset from the start of > the > header to which the Arria10 jumps. This offset must not be negative, > yet > the header is placed at offset 0x40 of the bootable binary. > Therefore, to > jump into U-Boot, add a trampoline just past the Arria10 boot header > and > point to this trampoline at fixed offset from the header generated > using > the mkimage -T socfpgaimage_v1 . Note that it is not needed to jump > back > to offset 0x0 of the image, it is possible to jump directly at the > reset > label and save processing two instructions. > > Signed-off-by: Marek Vasut > Cc: Dinh Nguyen > Cc: Chin Liang See > --- >  arch/arm/mach-socfpga/include/mach/boot0.h | 4 ++-- >  1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm/mach-socfpga/include/mach/boot0.h > b/arch/arm/mach-socfpga/include/mach/boot0.h > index d6b9435d33..06bbe27d2c 100644 > --- a/arch/arm/mach-socfpga/include/mach/boot0.h > +++ b/arch/arm/mach-socfpga/include/mach/boot0.h > @@ -18,10 +18,10 @@ _start: >   .word 0xcafec0d3; /* Checksum, zero-pad */ >   nop; >   > - b reset; /* SoCFPGA jumps here */ > - nop; > + b reset; /* SoCFPGA Gen5 jumps here */ >   nop; >   nop; > + b reset; /* SoCFPGA Gen10 trampoline */ Our mkpimage tools from SOCEDS is using 0x14 as offset. Wonder can we standardize that by using 0x14 instead of proposed 0x18 in this patch? Thanks Chin Liang >  #endif >   >  #endif /* __BOOT0_H */