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bootvx: x86: Explicitly clear the bootloader image size

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VxWorks bootloader stores its size at a pre-defined offset @ 0x5004.
Later when VxWorks kernel boots up and system memory information is
retrieved from the E820 table, the bootloader size will be subtracted
from the total system memory size to calculate the size of available
memory for the OS.

Explicitly clear the bootloader image size otherwise if memory
at this offset happens to contain some garbage data, the final
available memory size for the kernel is insane.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng
2018-04-11 22:02:08 -07:00
parent 2902be86c1
commit 1351700cf2
2 changed files with 16 additions and 0 deletions
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7
cmd/elf.c
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@@ -348,6 +348,13 @@ int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
info->entries = install_e820_map(E820MAX, data);
info->addr = (info->entries - 1) * sizeof(struct e820entry) +
E820_DATA_OFFSET;
/*
* Explicitly clear the bootloader image size otherwise if memory
* at this offset happens to contain some garbage data, the final
* available memory size for the kernel is insane.
*/
*(u32 *)(base + BOOT_IMAGE_SIZE_OFFSET) = 0;
#endif
/*