xilinx: common: Change bootm_size variable setting

Linux kernel for arm32 requires dtb and initrd to be placed in low memory
to work properly. This requirement is described in chapter 4b) and 5) in
Linux documentation (Documentation/arm/booting.rst).

There is an issue on arm32 with 2GB of memory that bootm_size is bigger
than Linux lowmem (for example with VMSPLIT_3G). That's why limit bootm
size on these systems not to be above 768MB.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
index 581c88ad49a48cd43a7a804c43ed63541dfa1491..eab389d049f2792f1b291aab4bceb7a7ab3c33cb 100644 (file)
--- a/board/xilinx/common/board.c
+++ b/board/xilinx/common/board.c
@@ -78,11 +78,15 @@ void *board_fdt_blob_setup(void)
 int board_late_init_xilinx(void)
 {
        u32 ret = 0;
+       phys_size_t bootm_size = gd->ram_size;
+
+       if (CONFIG_IS_ENABLED(ARCH_ZYNQ))
+               bootm_size = min(bootm_size, (phys_size_t)(SZ_512M + SZ_256M));
 
        ret |= env_set_hex("script_offset_f", CONFIG_BOOT_SCRIPT_OFFSET);
 
        ret |= env_set_addr("bootm_low", (void *)gd->ram_base);
-       ret |= env_set_addr("bootm_size", (void *)gd->ram_size);
+       ret |= env_set_addr("bootm_size", (void *)bootm_size);
 
        if (ret)
                printf("%s: Saving run time variables FAILED\n", __func__);