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Pad all but last sector in flash binary to write whole of sector (#800)

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Graham Sanderson 2022-05-10 13:03:44 -05:00 committed by GitHub
parent 81bdcb6681
commit 0d2591e1f1
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1 changed files with 27 additions and 1 deletions
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28
tools/elf2uf2/main.cpp
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@ -6,6 +6,7 @@
#include <cstdio>
#include <map>
#include <set>
#include <vector>
#include <cstring>
#include <cstdarg>
@ -21,6 +22,8 @@ typedef unsigned int uint;
#define ERROR_READ_FAILED -4
#define ERROR_WRITE_FAILED -5
#define FLASH_SECTOR_ERASE_SIZE 4096u
static char error_msg[512];
static bool verbose;
@ -295,6 +298,28 @@ int elf2uf2(FILE *in, FILE *out) {
MAIN_RAM_START, sp);
}
#endif
} else {
// Fill in empty dummy uf2 pages to align the binary to flash sectors (except for the last sector which we don't
// need to pad, and choose not to to avoid making all SDK UF2s bigger)
// That workaround is required because the bootrom uses the block number for erase sector calculations:
// https://github.com/raspberrypi/pico-bootrom/blob/c09c7f08550e8a36fc38dc74f8873b9576de99eb/bootrom/virtual_disk.c#L205
std::set<uint32_t> touched_sectors;
for (auto& page_entry : pages) {
uint32_t sector = page_entry.first / FLASH_SECTOR_ERASE_SIZE;
touched_sectors.insert(sector);
}
uint32_t last_page = pages.rbegin()->first;
for (uint32_t sector : touched_sectors) {
for (uint32_t page = sector * FLASH_SECTOR_ERASE_SIZE; page < (sector + 1) * FLASH_SECTOR_ERASE_SIZE; page += PAGE_SIZE) {
if (page < last_page) {
// Create a dummy page, if it does not exist yet. note that all present pages are first
// zeroed before they are filled with any contents, so a dummy page will be all zeros.
auto &dummy = pages[page];
}
}
}
}
uf2_block block;
block.magic_start0 = UF2_MAGIC_START0;
@ -308,7 +333,8 @@ int elf2uf2(FILE *in, FILE *out) {
block.target_addr = page_entry.first;
block.block_no = page_num++;
if (verbose) {
printf("Page %d / %d %08x\n", block.block_no, block.num_blocks, block.target_addr);
printf("Page %d / %d %08x%s\n", block.block_no, block.num_blocks, block.target_addr,
page_entry.second.empty() ? " (padding)": "");
}
memset(block.data, 0, sizeof(block.data));
rc = realize_page(in, page_entry.second, block.data, sizeof(block.data));