On Wed, May 25, 2016 at 9:50 AM, Andre Przywara andre.przywara@arm.com wrote:
Hi,
On 25/05/16 17:15, Steve Rae wrote:
Hi,
On Wed, May 25, 2016 at 1:48 AM, Hans de Goede <hdegoede@redhat.com mailto:hdegoede@redhat.com> wrote:
Hi, On 25-05-16 10:40, Andre Przywara wrote: Some SPL loaders (like Allwinner's boot0) require a header before the actual U-Boot binary to both check its validity and to find other data to load. Introduce a config option to reserve some space at the beginning of the binary to later hold the header if needed. Please note that the current arm64 start.S jumps over some portion of data already, so this option bascially just increases this region to allow post-processing tools to insert more data there. This also means that both filling the header is optional and also having some extra space in there does not hurt apart from enlarging the binary. For the use with Allwinner's boot0 blob there is a tool called boot0img[1], which fills the header to allow booting A64 based boards. For the Pine64 we need a 1536 Byte header (including the branch instruction) at the moment, so we add this to the defconfig. Signed-off-by: Andre Przywara <andre.przywara@arm.com <mailto:andre.przywara@arm.com>> [1] https://github.com/apritzel/pine64/tree/master/tools v2 looks good to me: Acked-by: Hans de Goede <hdegoede@redhat.com <mailto:hdegoede@redhat.com>> Tom, can you pick this one up please (I'm asking you since it is touching some non sunxi files) ? Regards, Hans --- arch/arm/cpu/armv8/start.S | 3 +++ board/sunxi/Kconfig | 7 +++++++ configs/pine64_plus_defconfig | 1 + include/configs/sun50i.h | 4 ++++ 4 files changed, 15 insertions(+) diff --git a/arch/arm/cpu/armv8/start.Sb/arch/arm/cpu/armv8/start.S
index e933021..a9cd7e9 100644 --- a/arch/arm/cpu/armv8/start.S +++ b/arch/arm/cpu/armv8/start.S @@ -21,6 +21,9 @@ _start: b reset +#ifdef CONFIG_START_HEADER_SPACE + .space CONFIG_START_HEADER_SPACE /* can be filled with a boot0 header */ +#endif .align 3Just wondering, is there any way to make this even more generic? In your case, you are wanting .space 1532 But in my case I am actually wanting something like: .word 0x12345678 .word _end - _start Thanks, Steve
I don't think we should go down that rabbit hole. Mainline U-Boot just provides the space for it, and you have a post-processing tool that fills it. This is what we do for Allwinner's boot0 (which includes magics, checksums, sizes, load address, etc.) You could even include this tool in the build process, similar to mkimage calls.
Or if you like, feel free to send a patch which shows how you imagine that.
Cheers, Andre.
I agree that this _might_ be a rabbit hole, but the following is fairly straightforward and seems to work:
+#ifdef CONFIG_BOOT0_CODE +CONFIG_BOOT0_CODE +#endif
( then elsewhere: ) +#define CONFIG_BOOT0_CODE \ + .word 0x12345678; \ + .word _end - _start
And for your code: +#define CONFIG_BOOT0_CODE \ + .space 1532
The "hint" is that these lines need to start with a tab, and need the semi-colon to separate lines.... Would this work for you? Thanks Steve
.globl _TEXT_BASE diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index fa78720..9f2e17e 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -15,6 +15,13 @@ config SUNXI_GEN_SUN6I separate ahb reset control registers, custom pmic bus, new style watchdog, etc. +config SUNXI_BOOT0 + bool "prepare for boot0 header" + ---help--- + If U-Boot is loaded from the Allwinner provided boot0 blob, it + expects a header area filled with magic values. + This option will add some space at the beginning of the image to + let a tool later on fill in this header with sensibledata.
choice prompt "Sunxi SoC Variant" diff --git a/configs/pine64_plus_defconfig b/configs/pine64_plus_defconfig index 0977334..b93e4da 100644 --- a/configs/pine64_plus_defconfig +++ b/configs/pine64_plus_defconfig @@ -18,3 +18,4 @@ CONFIG_CMD_EXT2=y CONFIG_CMD_EXT4=y CONFIG_CMD_FAT=y CONFIG_CMD_FS_GENERIC=y +CONFIG_SUNXI_BOOT0=y diff --git a/include/configs/sun50i.h b/include/configs/sun50i.h index 0fdb4c7..6923b60 100644 --- a/include/configs/sun50i.h +++ b/include/configs/sun50i.h @@ -17,6 +17,10 @@ #define GICD_BASE 0x1c81000 #define GICC_BASE 0x1c82000 +#ifdef CONFIG_SUNXI_BOOT0 +#define CONFIG_START_HEADER_SPACE 1532 +#endif + /* * Include common sunxi configuration where most the settingsare
*/